Add separate documentation for the ODROID-HC4 board to ensure
users build U-Boot using the HC4 defconfig that enables PCIe
SATA boot. This avoids user frustration trying to boot after
using the C4 recipe which only works from SD card.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-34-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
GS-King-X is also supported with the beelink-s922x FIP sources and can use
the GT-King defconfig. Add a board document with instructions.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-33-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Improve documentation. Notably we can now support U-Boot install to
the internal eMMC storage in addition to SD cards.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-22-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Improve documentation. Notably we can now support U-Boot install to
the internal eMMC storage in addition to SD cards.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-21-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Improve documentation. Notably mention the ODROID-N2+ and the option
to use FDTDIR not FDT for automatic device-tree selection.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-19-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Improve documentation. Notably drop references to the ODROID-HC4 board
as its support has evolved and we will add an HC4 specific document in
a later patch.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-17-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Improve documentation. Notably we can now support U-Boot install to
the removable eMMC storage module in addition to SD cards.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-15-christianshewitt@gmail.com
[narmstrong: fixed doc build]
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Improve documentation. Notably we remove all the board names from the
feature matrix to reduce table width. SoC types have been added to the
titles in individual board documents so readers can still correlate a
board against the features. This makes it easier to add new boards to
to the document in the future.
Signed-off-by: Christian Hewitt <christianshewitt@gmail.com>
Link: https://lore.kernel.org/r/20230320114609.930145-2-christianshewitt@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Add support for both the BananaPi BPI-CM4 module and the BananaPi
baseboard which is compatible with the RaspberryPi CM4IO baseboard.
The BananaPi BPI-CM4 module follows the CM4 specifications at [1],
but with a single HDMI port and a single DSI output.
The current CM4IO baseboard DT should work fine on the Raspberry CM4
baseboard and other derivatives baseboards, but proper DT should
be written for other baseboards.
[1] https://datasheets.raspberrypi.com/cm4io/cm4io-datasheet.pdf
Link: https://lore.kernel.org/r/20230307-u-boot-cm4-v1-2-43f5a393cd37@linaro.org
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Documentation:
* man-page for coninfo command
* documentation style
* switch settings for boot modes on AM62 SK
UEFI:
* avoid using deprecated HandleProtocol()
* set static attribute for non-exported functions and variables
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Merge tag 'efi-2023-07-rc1' of https://source.denx.de/u-boot/custodians/u-boot-efi
Pull request for efi-2023-07-rc1
Documentation:
* man-page for coninfo command
* documentation style
* switch settings for boot modes on AM62 SK
UEFI:
* avoid using deprecated HandleProtocol()
* set static attribute for non-exported functions and variables
Mention that HTML pages are published at https://u-boot.readthedocs.io/
and that the file .readthedocs.yml controls the build process.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
List some common boot modes and their corresponding switch
settings for AM62 SK.
Signed-off-by: Judith Mendez <jm@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Provide a reference document for the U-Boot documentation style.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Provide the basic HSCIF support for R-Car SoC.
Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Hai Pham <hai.pham.ud@renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
[Marek: Fill in HSSRR offset for Gen2 and SCBRR calculation for Gen2 and Gen3]
Reviewed-by: Simon Glass <sjg@chromium.org>
Explain block maps by going through two common use-cases.
Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Update the Android documentation to describe version 3 and 4 of boot
image header.
Signed-off-by: Safae Ouajih <souajih@baylibre.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Beacon Embedded has an i.MX8M Plus development kit which consists
of a SOM + baseboard. The SOM includes Bluetooth, WiFi, QSPI, eMMC,
and one Ethernet PHY. The baseboard includes audio, HDMI, USB-C Dual
Role port, USB Hub with five ports, a PCIe slot, and a second Ethernet
PHY. The device trees are already queued for inclusion in Linux 6.3.
Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
The input provided to sgdisk is in fact aimed for sfdisk. The use of
sgdisk and sfdisk, coming from different projects, is not the same.
So, this commit translates the sfdisk-formatted input into
sgdisk-compatible options. Partitions are not modified.
Signed-off-by: Corentin Guillevic <corentin.guillevic@smile.fr>
'git push -o ci.skip' can be used to push to Gitlab without triggering a
pipeline.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
---------------------------------
CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/15819
i.MX patches queued for next:
- Conversions to DM_SERIAL
- Fixes for Toradex boards
- Gateworks Boards
- i.MX8ULP
- EQoS support / fixes, changes in boards
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Merge tag 'u-boot-imx-next-20230331' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx into next
u-boot-imx-next-20230331 for next
---------------------------------
CI: https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/15819
i.MX patches queued for next:
- Conversions to DM_SERIAL
- Fixes for Toradex boards
- Gateworks Boards
- i.MX8ULP
- EQoS support / fixes, changes in boards
There was a conflict between the following two commits, that wasn't
resolved correctly. Fix this.
a93985ddfc ("doc: sl-mx8mm: Update the NXP TF-A source reference")
f0f461287e ("imx: Suggest the NXP ATF github repo")
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Cc: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Cc: Fabio Estevam <festevam@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Reviewed-by: Fabio Estevam <festevam@denx.de>
The M.2 slots of the related IOT2050 variant need to be configured
according to the plugged cards. This tries to detect the card using the
M.2 configuration pins of the B-key slot. If that fails, a U-Boot
environment variable can be set to configure manually. This variable is
write-permitted also in secure boot mode as it is not able to undermine
the integrity of the booted system.
The configuration is then applied to mux the serdes and to fix up the
device tree passed to or loaded by the bootloader. The fix-ups are
coming from device tree overlays that are embedded into the firmware
image and there also integrity protected. The OS remains free to load
a device tree to which they do not apply: U-Boot will not fail to boot
in that case.
Based on original patch by Chao Zeng.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Add support for the M.2 board based on the iot2050 advanced board.
The board has two m.2 connectors, one is B-keyed, the other E-keyed.
The B-key slot can connect 5G/SSD devices, and E-key can be used for
WIFI/BT devices.
This variant is covered by PG2 firmware image.
Signed-off-by: chao zeng <chao.zeng@siemens.com>
[Jan: align DT to kernel, polish wording]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Use external blob otpcmd.bin to replace the 0xff filled OTP programming
command block to create a firmware image that provisions the OTP on
first boot. This otpcmd.bin is generated from the customer keys using
steps described in the meta-iot2050 integration layer for the device.
Based on original patch by Baocheng Su.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
There are many ways to get a signed firmware for the IOT2050 devices,
namely for the parts under user-control. This script documents one way
of doing it, given a signing key. Augment the board documentation with
the required procedure around it.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
The latest version of the binary-only firmware parts come in a combined
form of FSBL and sysfw containers. This implies some layout changes to
the generated firmware image but also makes handling of artifacts much
simpler (4 files less). The env locations will not change, just the
space reserved for U-Boot will shrink from 4 to 3 MB - still plenty of
space left in practice.
Adjust configuration and documentation accordingly.
Along this change, add a new reservation for update commands of the
user-controlled OTP part. A specific userspace tool will fill it, and
the FSBL will evaluate it during boot. This reservation will use 64K of
the former sysfw section.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Due to different signature keys, the PG1 and the PG2 boards can no
longer use the same FSBL (tiboot3). This makes it impossible anyway to
maintaine a single flash.bin for both variants, so we can also split the
build.
A new target is added to indicates the build is for PG1 vs. PG2 boards.
Hence now the variants have separated defconfig files.
The runtime board_is_sr1() check does make no sense anymore, so remove
it and replace with build time check.
Documentation is updated accordingly. New binary artifacts are already
available via meta-iot2050.
Signed-off-by: Su Baocheng <baocheng.su@siemens.com>
[Jan: refactor config option into targets, tweak some wordings]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
With recent CONFIG_TEXT_BASE changes, there are inconsistencies between
several settings.
Adjust CONFIG_SYS_MONITOR_LEN to allow more code space. Move the MRC
cache out of the way too.
Add documentation on how to make this change safely.
Fixes: 66e2c665f3 ("x86: minnowmax: Adjust CONFIG_TEXT_BASE")
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Documenation:
* add man-page for efi command
UEFI:
* Let EFI app call ExitBootServices() before legacy booting kernel
* Support zboot and bootm in the EFI app
* Let efi command show configuration tables
* Support booting a 64-bit kernel from 64-bit EFI app
* Allocate device-tree copy from high memory
* simplify efi_str_to_u16()
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Merge tag 'efi-next-20230325' of https://source.denx.de/u-boot/custodians/u-boot-efi into next
Pull request for efi-next-20230325
Documenation:
* add man-page for efi command
UEFI:
* Let EFI app call ExitBootServices() before legacy booting kernel
* Support zboot and bootm in the EFI app
* Let efi command show configuration tables
* Support booting a 64-bit kernel from 64-bit EFI app
* Allocate device-tree copy from high memory
* simplify efi_str_to_u16()
Add a command (for the app and payload) to display the tables provided
by EFI. Note that for the payload the tables should always be present, so
an error message is unnecessary and would bloat the code.
Signed-off-by: Simon Glass <sjg@chromium.org>
As explained in the text at the bottom of the page
https://source.codeaurora.org/external/qoriq/qoriq-yocto-sdk/boot-format:
"QUIC repositories on this site will not receive any updates after
March 31, 2022, and will be deleted on March 31, 2023."
Point to the NXP boot format github repo instead.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Pali Rohár <pali@kernel.org>
The read and write commands are, deliberately, implemented in the same
file, so that they stay feature-compatible (e.g. if someone implements
support for "read the full partition, however large that is", that
same syntax should also work for write). In order to ensure the
documentation for both are similarly kept in sync, and to avoid
duplication, document them both in read.rst, and add a stub write.rst
referring to read.rst.
Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Reviewed-by: Simon Glass <sjg@chromium.org>
Provide a man-page for the panic command.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Fix a couple of links so that they are rendered correctly with sphinx.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
This is quite a useful thing to use when building since it avoids small
size changes between commits. Add a -r flag for it.
Also undefine CONFIG_LOCALVERSION_AUTO since this appends the git hash
to the version string, causing every build to be slightly different.
Signed-off-by: Simon Glass <sjg@chromium.org>
This change allows to load boot image from the first SATA/SCSI device
partition and burn it to board boot location (e.g. SPI-NOR). This is
particularly when storage device is not handled by U-Boot as USB mass
storage (which is already supported by bubt) but as SATA/SCSI device.
Signed-off-by: Pali Rohár <pali@kernel.org>
All 32-bit Armada SoCs and also 64-bit Armada 3720 SoC can load and boot
firmware from SATA disk. This adds support for updating firmware binary for
these SoCs. On 32-bit Armada SoC is firmware stored at sector 1 and on
Armada 3720 is stored at MBR partition 0x4d or GPT partition with type GUID
6828311A-BA55-42A4-BCDE-A89BB5EDECAE (Marvell Armada 3700 Boot partition).
Signed-off-by: Pali Rohár <pali@kernel.org>
Support for burning into the correct eMMC HW boot partition was broken and
removed in commit 96be2f0727 ("mvebu: bubt: Drop dead code"). Reimplement
this functionality and bring it back again.
Fixes: 96be2f0727 ("mvebu: bubt: Drop dead code")
Signed-off-by: Pali Rohár <pali@kernel.org>
ROCK 5B is a Rockchip RK3588 based SBC (Single Board Computer) by Radxa.
There are tree variants depending on the DRAM size : 4G, 8G and 16G.
Specification:
Rockchip Rk3588 SoC
4x ARM Cortex-A76, 4x ARM Cortex-A55
4/8/16GB memory LPDDR4x
Mali G610MC4 GPU
MIPI CSI 2 multiple lanes connector
eMMC module connector
uSD slot (up to 128GB)
2x USB 2.0, 2x USB 3.0
2x HDMI output, 1x HDMI input
Ethernet port
40-pin IO header including UART, SPI, I2C and 5V DC power in
USB PD over USB Type-C
Size: 85mm x 54mm
Kernel commits:
a1d3281450ab ("arm64: dts: rockchip: Add rock-5b board")
6fb13f888f2a ("arm64: dts: rockchip: Update sdhci alias for rock-5b")
Signed-off-by: Eugen Hristev <eugen.hristev@collabora.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Neural Compute Module 6(Neu2) is a 96boards SoM-CB compute module
based on Rockchip RK3588 from Edgeble AI.
General features:
- Rockchip RK3588
- up to 32GB LPDDR4x
- up to 128GB eMMC
- 2x MIPI CSI2 FPC
On module WiFi6/BT5 is available in the following Neu6 variants.
Neural Compute Module 6(Neu6) IO board is an industrial form factor
ready-to-use IO board from Edgeble AI.
IO board offers plenty of peripherals and connectivity options and
this patch enables basic eMMC and UART which is enough to successfully
boot Linux.
Neu6 needs to mount on top of this IO board in order to create a
complete Edgeble Neural Compute Module 6(Neu6) IO platform.
Boot log for the record,
DDR Version V1.08 20220617
LPDDR4X, 2112MHz
channel[0] BW=16 Col=10 Bk=8 CS0 Row=16 CS1 Row=16 CS=2 Die BW=16 Size=2048MB
channel[1] BW=16 Col=10 Bk=8 CS0 Row=16 CS1 Row=16 CS=2 Die BW=16 Size=2048MB
channel[2] BW=16 Col=10 Bk=8 CS0 Row=16 CS1 Row=16 CS=2 Die BW=16 Size=2048MB
channel[3] BW=16 Col=10 Bk=8 CS0 Row=16 CS1 Row=16 CS=2 Die BW=16 Size=2048MB
Manufacturer ID:0x6
CH0 RX Vref:31.7%, TX Vref:21.8%,21.8%
CH1 RX Vref:30.7%, TX Vref:22.8%,23.8%
CH2 RX Vref:30.7%, TX Vref:22.8%,22.8%
CH3 RX Vref:30.7%, TX Vref:21.8%,21.8%
change to F1: 528MHz
change to F2: 1068MHz
change to F3: 1560MHz
change to F0: 2112MHz
out
U-Boot SPL 2023.01-00952-g1d1785a516-dirty (Jan 30 2023 - 19:53:55 +0530)
Trying to boot from MMC1
INFO: Preloader serial: 2
NOTICE: BL31: v2.3():v2.3-391-g856309329:derrick.huang
NOTICE: BL31: Built : 14:15:50, Jul 18 2022
INFO: ext 32k is not valid
INFO: GICv3 without legacy support detected.
INFO: ARM GICv3 driver initialized in EL3
INFO: system boots from cpu-hwid-0
INFO: idle_st=0x21fff, pd_st=0x11fff9, repair_st=0xfff70001
INFO: dfs DDR fsp_params[0].freq_mhz= 2112MHz
INFO: dfs DDR fsp_params[1].freq_mhz= 528MHz
INFO: dfs DDR fsp_params[2].freq_mhz= 1068MHz
INFO: dfs DDR fsp_params[3].freq_mhz= 1560MHz
INFO: BL31: Initialising Exception Handling Framework
INFO: BL31: Initializing runtime services
WARNING: No OPTEE provided by BL2 boot loader, Booting device without OPTEE initialization. SMC`s destined for OPTEE will return SMC_UNK
ERROR: Error initializing runtime service opteed_fast
INFO: BL31: Preparing for EL3 exit to normal world
INFO: Entry point address = 0xa00000
INFO: SPSR = 0x3c9
U-Boot 2023.01-00952-g1d1785a516-dirty (Jan 30 2023 - 19:53:55 +0530)
Model: Edgeble Neu6A IO Board
DRAM: 7.5 GiB (effective 3.7 GiB)
Core: 71 devices, 15 uclasses, devicetree: separate
MMC: mmc@fe2c0000: 0
Loading Environment from nowhere... OK
In: serial@feb50000
Out: serial@feb50000
Err: serial@feb50000
Model: Edgeble Neu6A IO Board
Net: No ethernet found.
Hit any key to stop autoboot: 0
=>
Add support for Edgeble Neu6 Model A IO Board.
Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Update the MAINTAINERS file to include the devicetree for the
rk3568-evb1-v10 board.
Also update Rockchip board docs to include information on building
RK3568 based devices.
Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Rockchip SoCs typically use U-Boot TPL to initialize DRAM, then jumps
back to BootRom to load next stage, U-Boot SPL, into DRAM. BootRom then
jumps to U-Boot SPL to continue the normal boot flow.
However, there is no support to initialize DRAM on RK35xx SoCs using
U-Boot TPL and instead an external TPL binary must be used to generate a
bootable u-boot-rockchip.bin image.
Add CONFIG_ROCKCHIP_EXTERNAL_TPL to indicate that an external TPL should
be used. Build U-Boot with ROCKCHIP_TPL=/path/to/ddr.bin to generate a
bootable u-boot-rockchip.bin image for RK3568.
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Eugen Hristev <eugen.hristev@collabora.com>
This function allows updating bootloader from u-boot
on production devices without need in host PC.
Be aware! It works only with re-crypt BCT.
Tested-by: Robert Eckelmann <longnoserob@gmail.com> # ASUS TF101 T20
Signed-off-by: Ramin Khonsari <raminterex@yahoo.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Tom <twarren@nvidia.com>
This patch adds a brief introduction to the RISC-V architecture and
the typical boot process used on a variety of RISC-V platforms.
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Rick Chen <rick@andestech.com>
Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Convert the documentation for the Broadcom BCM7445 and BCM7260 boards
to reStructuredText format and add the new filename to
doc/board/broadcom/index.rst.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Fix typo and whitespace in the document.
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The current ae350-related defconfigs could also
support newer Andes CPU IP, so modify the names of CPU
from ax25 to andesv5, and board name from ax25-ae350 to ae350.
Signed-off-by: Leo Yu-Chi Liang <ycliang@andestech.com>
Reviewed-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Rick Chen <rick@andestech.com>
Now that Linux has accepted these tags, move U-Boot over to use them.
Tidy up the comments and formatting, making sure that VPL is mentioned
too.
Signed-off-by: Simon Glass <sjg@chromium.org>
U-Boot has some particular challenges with device tree and devices:
- U-Boot has multiple build phases, such as a Secondary Program Loader
(SPL) phase which typically runs in a pre-SDRAM environment where code
and data space are limited. In particular, there may not be enough
space for the full device tree blob. U-Boot uses various automated
techniques to reduce the size from perhaps 40KB to 3KB. It is not
always possible to handle these tags entirely at build time, since
U-Boot proper must have the full device tree, even though we do not
want it to process all nodes until after relocation.
- Some U-Boot phases needs to run before the clocks are properly set up,
where the CPU may be running very slowly. Therefore it is important to
bind only those devices which are actually needed in that phase
- U-Boot uses lazy initialisation for its devices, with 'bind' and
'probe' being separate steps. Even if a device is bound, it is not
actually probed until it is used. This is necessary to keep the boot
time reasonable, e.g. to under a second
The phases of U-Boot in order are: TPL, VPL, SPL, U-Boot (first
pre-relocation, then post-relocation). ALl but the last two are optional.
For the above reasons, U-Boot only includes the full device tree in the
final 'U-Boot proper' build. Even then, before relocation U-Boot only
processes nodes which are marked as being needed.
For this to work, U-Boot's driver model[1] provides a way to mark device
tree nodes as applicable for a particular phase. This works by adding a
tag to the node, e.g.:
cru: clock-controller@ff760000 {
bootph-all;
compatible = "rockchip,rk3399-cru";
reg = <0x0 0xff760000 0x0 0x1000>;
rockchip,grf = <&grf>;
#clock-cells = <1>;
#reset-cells = <1>;
...
};
Here the "bootph-all" tag indicates that the node must be present in all
phases, since the clock driver is required.
There has been discussion over the years about whether this could be done
in a property instead, e.g.
options {
bootph-all = <&cru> <&gpio_a> ...;
...
};
Some problems with this:
- we need to be able to merge several such tags from different .dtsi files
since many boards have their own specific requirements
- it is hard to find and cross-reference the affected nodes
- it is more error-prone
- it requires significant tool rework in U-Boot, including fdtgrep and
the build system
- is harder (slower, more code) to process since it involves scanning
another node/property to find out what to do with a particular node
- we don't want to add phandle arguments to the above since we are
referring, e.g., to the clock device as a whole, not a paricular clock
- the of-platdata feature[2], which converts device tree to C for even
more constrained environments, would need to become aware of the
/options node
There is also the question about whether this needs to be U-Boot-specific,
or whether the tags could be generic. From what I can tell, U-Boot is the
only bootloader which seriously attempts to use a runtime device tree in
all cases. For this version, an attempt is made to name the phases in a
generic manner.
It should also be noted that the approach provided here has stood the test
of time, used in U-Boot for 8 years so far.
So add the schema for this. This will allow a major class of schema
exceptions to be dropped from the U-Boot source tree.
This has been applied upstream[3]
[1] https://u-boot.readthedocs.io/en/latest/develop/driver-model/index.html
[2] https://u-boot.readthedocs.io/en/latest/develop/driver-model/of-plat.html
[3] https://github.com/devicetree-org/dt-schema/commit/63bd847
Signed-off-by: Simon Glass <sjg@chromium.org>
