Add a README with a brief guide to porting serial drivers over to use
driver model.
Add a timeline also. All serial drivers should be converted by the end
of January 2016.
Signed-off-by: Simon Glass <sjg@chromium.org>
Some boards have an i8042 device. Enable the driver for all x86 boards, and
add a device tree node for those which may have this keyboard.
Also adjust the configuration so that i8042 is always separate from the VGA,
and rename the stdin driver accordingly. With this commit the keyboard will
not work, but it is fixed in the next commit.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Add a sandbox timer which get time from host os and a basic
test.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>
Add support for loading splash image from an SD card formatted with
a filesystem. Update boards to maintain original behavior where needed.
Cc: Igor Grinberg <grinberg@compulab.co.il>
Cc: Tom Rini <trini@konsulko.com>
Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
short strings can be used in type parameter of gpt command
to replace the guid string for the types known by u-boot
partitions = name=boot,size=0x6bc00,type=data; \
name=root,size=0x7538ba00,type=linux;
gpt write mmc 0 $partitions
and they are also used to display the type of partition
in "part list" command
Partition Map for MMC device 0 -- Partition Type: EFI
Part Start LBA End LBA Name
Attributes
Type GUID
Partition GUID
1 0x00000022 0x0000037f "boot"
attrs: 0x0000000000000000
type: ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
type: data
guid: d117f98e-6f2c-d04b-a5b2-331a19f91cb2
2 0x00000380 0x003a9fdc "root"
attrs: 0x0000000000000000
type: 0fc63daf-8483-4772-8e79-3d69d8477de4
type: linux
guid: 25718777-d0ad-7443-9e60-02cb591c9737
Signed-off-by: Patrick Delaunay <patrick.delaunay73@gmail.com>
code under flag CONFIG_PARTITION_TYPE_GUID
add parameter "type" to select partition type guid
example of use with gpt command :
partitions = uuid_disk=${uuid_gpt_disk}; \
name=boot,size=0x6bc00,uuid=${uuid_gpt_boot}; \
name=root,size=0x7538ba00,uuid=${uuid_gpt_root}, \
type=0fc63daf-8483-4772-8e79-3d69d8477de4;
gpt write mmc 0 $partitions
Signed-off-by: Patrick Delaunay <patrick.delaunay73@gmail.com>
Previously, Linux used the same GUID for the data partitions as Windows
(Basic data partition: EBD0A0A2-B9E5-4433-87C0-68B6B72699C7).
This created problems when dual-booting Linux and Windows in UEFI-GPT
Setup, so a new GUID (Linux filesystem data:
0FC63DAF-8483-4772-8E79-3D69D8477DE4) was defined jointly by GPT fdisk
and GNU Parted developers.
Signed-off-by: Patrick Delaunay <patrick.delaunay73@gmail.com>
The 10m50 devboard becomes the new golden reference design of
Nios II Linux. So change README.nios2 to use 10m50 as template.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Marek Vasut <marex@denx.de>
Add Altera Generic Quad SPI Controller support. The controller
converts SPI NOR flash to parallel flash interface. So it is
not like other SPI flash, but rather like CFI flash.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
After consulting with some of the SPDX team, the conclusion is that
Makefiles are worth adding SPDX-License-Identifier tags too, and most of
ours have one. This adds tags to ones that lack them and converts a few
that had full (or in one case, very partial) license blobs into the
equivalent tag.
Cc: Kate Stewart <kstewart@linuxfoundation.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Revert commit 7a2c1b13 which dropped OpenRD boards.
Assume maintainership of OpenRD.
Remove OpenRD from scrapyard.
Switch OpenRD to generic board.
Switch to Thumb build.
Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
This commit adds:
- new uclass id: UCLASS_ADC
- new uclass driver: drivers/adc/adc-uclass.c
The new uclass's API allows for ADC operation on:
* single-channel with channel selection by a number
* multti-channel with channel selection by bit mask
ADC uclass's functions:
* single-channel:
- adc_start_channel() - start channel conversion
- adc_channel_data() - get conversion data
- adc_channel_single_shot() - start/get conversion data
* multi-channel:
- adc_start_channels() - start selected channels conversion
- adc_channels_data() - get conversion data
- adc_channels_single_shot() - start/get conversion data for channels
selected by bit mask
* general:
- adc_stop() - stop the conversion
- adc_vdd_value() - positive reference Voltage value with polarity [uV]
- adc_vss_value() - negative reference Voltage value with polarity [uV]
- adc_data_mask() - conversion data bit mask
The device tree can provide below constraints/properties:
- vdd-polarity-negative: if true: Vdd = vdd-microvolts * (-1)
- vss-polarity-negative: if true: Vss = vss-microvolts * (-1)
- vdd-supply: phandle to Vdd regulator's node
- vss-supply: phandle to Vss regulator's node
And optional, checked only if the above corresponding, doesn't exist:
- vdd-microvolts: positive reference Voltage [uV]
- vss-microvolts: negative reference Voltage [uV]
Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This driver allows I/O operations on the Samsung S2MPS11 PMIC,
which provides lots of LDO/BUCK outputs.
To enable it, update defconfig with:
- CONFIG_PMIC_S2MPS11
and additional, if were not defined:
- CONFIG_CMD_PMIC
- CONFIG_ERRNO_STR
The binding info: doc/device-tree-bindings/pmic/s2mps11.txt
Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
The CPU name for Exynos was concatenated with cpu id,
but for new Exynos platforms, like Chromebook Peach Pi
based on Exynos5800, the name of SoC variant does not
include the real SoC cpu id (0x5422).
For such case, the CPU name should be defined in device tree.
This commit introduces new device-tree property for Exynos:
- "cpu-model" - with cpu name string
If defined, then the cpu id is not printed.
Signed-off-by: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Minkyu Kang <mk7.kang@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Anand Moon <linux.amoon@gmail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
Signed-off-by: Hou Zhiqiang <B48286@freescale.com>
Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Mingkai Hu <Mingkai.Hu@freescale.com>
Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
For most PPC platforms, they will call the first get_clocks() in
init_sequence_f[] as they define CONFIG_PPC. CONFIG_SYS_FSL_CLK is
then defined to call the second get_clocks(), which should be
redundant for PPC.
Signed-off-by: Gong Qianyu <Qianyu.Gong@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
This board has not compiled for me for quite some time due to size
constraints, remove.
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This board has not compiled for me for quite some time due to size
constraints, remove.
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This board has not compiled for me for quite some time due to size
constraints, remove.
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
This board has not compiled for me for quite some time due to size
constraints, remove.
Cc: John Otken <jotken@softadvances.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Added device-tree-binding information for zynq qspi controller
driver.
Signed-off-by: Jagan Teki <jteki@openedev.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Tested-by: Jagan Teki <jteki@openedev.com>
Export fdt_blob to the environment variable. So that we may
use it to boot Linux.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Simon Glass <sjg@chromium.org>
The current name is inconsistent with other driver model data access
functions. Rename it and fix up all users.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Joe Hershberger <joe.hershberger@ni.com>
Convert altera_tse to driver model and phylib.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Convert altera sysid to driver model with misc uclass.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Chin Liang See <clsee@altera.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Convert nios2 cpu to driver model. The cpu parameters are
extracted from device tree and saved to global data structure.
We will use them to replace the custom_fpga.h .
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>
Convert altera_pio to driver model.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Chin Liang See <clsee@altera.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Convert altera_uart to driver model.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Marek Vasut <marex@denx.de>
Convert altera_jtag_uart to driver model.
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Acked-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Many System on Chip(SoC) solutions are complex with multiple processors
on the same die dedicated to either general purpose of specialized
functions. Many examples do exist in today's SoCs from various vendors.
Typical examples are micro controllers such as an ARM M3/M0 doing a
offload of specific function such as event integration or power
management or controlling camera etc.
Traditionally, the responsibility of loading up such a processor with a
firmware and communication has been with a High Level Operating
System(HLOS) such as Linux. However, there exists classes of products
where Linux would need to expect services from such a processor or the
delay of Linux and operating system being able to load up such a
firmware is unacceptable.
To address these needs, we need some minimal capability to load such a
system and ensure it is started prior to an Operating System(Linux or
any other) is started up.
NOTE: This is NOT meant to be a solve-all solution, instead, it tries to
address certain class of SoCs and products that need such a solution.
A very simple model is introduced here as part of the initial support
that supports microcontrollers with internal memory (no MMU, no
execution from external memory, or specific image format needs). This
basic framework can then (hopefully) be extensible to other complex SoC
processor support as need be.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Simon Glass <sjg@chromium.org>
Now that we have added MRC cache for Intel FSP and BayTrail codes,
enable it for all BayTrail boards (Bayley Bay and Minnow Max).
Note it turns out that FSP for Intel Atom E6xx does not produce
the HOB for NV storage, so we don't have such functionality on
Intel Crown Bay board.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Introduce a new fsp command and make the existing hob command a
sub-command to fsp for future extension. Also move cmd_hob.c to
the dedicated fsp sub-directory in arch/x86/lib.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
System Management BIOS (SMBIOS) is a specification for how
motherboard and system vendors present management information
about their products in a standard format by extending the BIOS
interface on Intel architecture systems. As of today the latest
spec is 3.0 and can be downloaded from DMTF website. This commit
adds a simple and minimum required implementation.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Current document about how to boot VxWorks is limited.
Add several chapters in README.vxworks to document this.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This reverts commit 8fe11b8901.
I'll add support to lwmon5 in the next patch and will remove
support for the broken lcd4_lwmon5 as well.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
The DDR SDRAM initialization code has not been mainlined yet, but
U-Boot proper should work.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
The DDR SDRAM initialization code has not been mainlined yet, but
U-Boot proper should work.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Desktop Management Interface (DMI) is not supported by U-Boot now.
Add it to the TODO list.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Document porting considerations for Intel Quark based board,
including MRC parameters and PCIe initialization.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
This board has not been converted to generic board by the deadline.
Remove it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Stefano Babic <sbabic@denx.de>
CONFIG_X86_OPTION_ROM_ADDR has been renamed to CONFIG_VGA_BIOS_ADDR.
Update the doc to refer to the new name.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Documentation file for DFU extension. With this functionality it is now
possible to transfer FIT images with firmware updates via TFTP and use
DFU backend for storing them.
Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
It is easier to paste these into the command line if they are a single
common. Use line continuation instead of separate lines.
Signed-off-by: Simon Glass <sjg@chromium.org>
MMC support works now, so it can be dropped from the todo
Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Instead of creating a rockchip SPL SD card image with 32KB of zeros
which can be written to the start of an SD card, create the images with
only the useful data that should be written to an offset of 32KB on the
SD card.
The first 32 kilobytes aren't needed for bootup and only serve as
convenient way of accidentally obliterating your partition table.
Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
The Radxa Rock pro board is rk3188 based and thus won't work with U-Boot
built for RK3288. Change the documentation to refer to the intended
board, the Radxa Rock 2, which is an RK3288-based design very similar to
the firefly
Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Simon Glass <sjg@chromium.org>
Bring in required device tree files from Linux. Since mainline Linux is
somewhat behind, use the files from the Chromium tree. We can re-sync once
further code is acccepted upstream.
Signed-off-by: Simon Glass <sjg@chromium.org>
These have not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Dan Malek <dan@embeddedalley.com>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Stefan Roese <sr@denx.de>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Stefan Roese <sr@denx.de>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Stefan Roese <sr@denx.de>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Remove CONFIG_LWMON5 references.
(Also, remove undefined CONFIG_WD_MAX_RATE while I am here.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Stefan Roese <sr@denx.de>
These have not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Tolunay Orkun <torkun@nextio.com>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Stefan Roese <sr@denx.de>
Extend the documentation of the fec_mxc configuration by describing its
ability to read the ethaddr MAC address from the SoC eFuses.
Also add an example how to program the fuses for an imx5 to clarify the
byte order.
Cc: Stefano Babic <sbabic at denx.de>
Cc: Marek Vasut <marex at denx.de>
Signed-off-by: Olaf Mandel <o.mandel at menlosystems.com>
Device Tree really improves code maintainability and is now
available for SPL too.
This is the state-of-the-art implementation in U-boot.
The board files (platform data) are no longer needed.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This is incorrect since we require the -m parameter to the microcode tool.
Update the two examples to show this.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
The doc has a misleading 'make menuconfig' when building the EFI
application and payload. Clarify this and also update information
on test with QEMU.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
With recent EFI support, the entry point address of coreboot payload
was changed. Now we update the address to use _x86boot_start, which
is the same one for EFI.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
This has not been converted to Generic Board, so should be removed.
(See doc/README.generic-board for details.)
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Heiko Schocher <hs@denx.de>
Acked-by: Marek Vasut <marex@denx.de>
It is a bit tedious to figure out the interrupt configuration for a new
x86 platform. Add a script which can do this, based on the output of
'pci long'. This may be helpful in some cases.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
* Explicitly list the targets supported in each section of the
instructions from the x86 README.
* Drop references to 'raw mode', in favor of 'bare mode'.
Signed-off-by: Igor Stoppa <igor.stoppa@intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Allow for configuration of FSP UPD from the device tree which will
override any settings which the FSP was built with itself.
Modify the MinnowMax and BayleyBay boards to transfer sensible UPD
settings from the Intel FSPv4 Gold release to the respective dts files,
with the condition that the memory-down parameters for MinnowMax are
also used.
Signed-off-by: Andrew Bradford <andrew.bradford@kodakalaris.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Removed fsp,mrc-debug-msg and fsp,enable-xhci for minnowmax, bayleybay
Fixed lines >80col
Signed-off-by: Simon Glass <sjg@chromium.org>
Add support for making the visual area of the framebuffer smaller and
drawing a black border around it. This is intended for use with
overscanning monitors (esp. with composite video out), to avoid part
of the picture being invisible.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Acked-by: Anatolij Gustschin <agust@denx.de>
We do not need that "regulator-name" property must be provided in dts.
If "regulator-name" property is not provided in dts, node name
will chosen for settings '.name' field of uc_pdata.
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Cc: Przemyslaw Marczak <p.marczak@samsung.com>
Cc: Simon Glass <sjg@chromium.org>
Add composite video out support.
This only gets enabled on the Mele M3 for now, since that is were it
was tested. It will be enabled on more boards after testing.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
This chip provides an eDP to LVDS bridge which is useful for SoCs that don't
support LVDS displays (or it would waste scarce pins). The setup is included
in the device tree.
Signed-off-by: Simon Glass <sjg@chromium.org>
While I2C supports multi-master buses this is difficult to get right.
The implementation on the master side in software is quite complex.
Clock-stretching and the arbitrary time that an I2C transaction can take
make it difficult to share the bus fairly in the face of high traffic.
When one or more masters can be reset independently part-way through a
transaction it is hard to know the state of the bus.
This driver provides a scheme based on two 'claim' GPIOs, one driven by the
AP (Application Processor, meaning the main CPU) and one driven by the EC
(Embedded Controller, a small CPU aimed at handling system tasks). With
these they can communicate and reliably share the bus. This scheme has
minimal overhead and involves very little code. It is used on snow to
permit the EC and the AP to share access to the main system PMIC and
battery. The scheme can survive reboots by either side without difficulty.
This scheme has been tested in the field with millions of devices.
Since U-Boot runs on the AP, the terminology used is 'our' claim GPIO,
meaning the AP's, and 'their' claim GPIO, meaning the EC's. This terminology
is used by the device tree bindings in Linux also.
Signed-off-by: Simon Glass <sjg@chromium.org>
Add a new I2C_MUX uclass. Devices in this class can multiplex between
several I2C buses, selecting them one at a time for use by the system.
The multiplexing mechanism is left to the driver to decide - it may be
controlled by GPIOs, for example.
The uclass supports only two methods: select() and deselect().
The current mux state is expected to be stored in the mux itself since
it is the only thing that knows how to make things work. The mux can
record the current state and then avoid switching unless it is necessary.
So select() can be skipped if the mux is already in the correct state.
Also deselect() can be made a nop if required.
Signed-off-by: Simon Glass <sjg@chromium.org>
Document the development flow on figuring out PIRQ information
during the U-Boot porting.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
Add some documentation on the EFI implementation in U-Boot.
Signed-off-by: Ben Stoltz <stoltz@google.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
