Commit graph

19 commits

Author SHA1 Message Date
Jean-Jacques Hiblot
f1d2bc9034 lib: fdtdec: Add function re-setup the fdt more effeciently
In some cases it may be useful to be able to change the fdt we have been
using and use another one instead. For example, the TI platforms uses an
EEPROM to store board information and, based on the type of board,
different dtbs are used by the SPL. When DM_I2C is used, a first dtb must
be used before the I2C is initialized and only then the final dtb can be
selected.
To speed up the process and reduce memory usage, introduce a new function
fdtdec_setup_best_match() that re-use the DTBs loaded in memory by
fdtdec_setup() to select the best match.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
2018-12-10 07:21:21 +01:00
Simon Glass
a15a7aa47b doc: Update docs for device tree in SPL, TPL
Make a few small updates to indicate that device tree can be used in SPL
and TPL.

Signed-off-by: Simon Glass <sjg@chromium.org>
2018-10-09 04:40:27 -06:00
Simon Glass
343864afd7 fdt: Document the fact that dtc is now built
This documentation is out of date now that U-Boot builds dtc
automatically. Update it.

Signed-off-by: Simon Glass <sjg@chromium.org>
2018-10-09 04:40:27 -06:00
Tom Rini
83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00
Alex Deymo
82f766d1d2 Allow boards to initialize the DT at runtime.
In some boards like the Raspberry Pi the initial bootloader will pass
a DT to the kernel. When using U-Boot as such kernel, the board code in
U-Boot should be able to provide U-Boot with this, already assembled
device tree blob.

This patch introduces a new config option CONFIG_OF_BOARD to use instead
of CONFIG_OF_EMBED or CONFIG_OF_SEPARATE which will initialize the DT
from a board-specific funtion instead of bundling one with U-Boot or as
a separated file. This allows boards like the Raspberry Pi to reuse the
device tree passed from the bootcode.bin and start.elf firmware
files, including the run-time selected device tree overlays.

Signed-off-by: Alex Deymo <deymo@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-05-09 20:35:06 -04:00
Philipp Tomsich
399f3afa37 doc: move documentation for /config node into a separate file
This moves the description of the /config node from README.fdt-control
into a separate file doc/device-tree-bindings/config.txt.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2017-03-20 18:04:35 -04:00
Simon Glass
89b199c3d4 Remove/update old generic-board documentation and warning
Remove the warning from the Makefile, since boards that do not use generic
board will no longer build. Also update documentation.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Andreas Bießmann <andreas@biessmann.org>
2016-05-27 15:39:50 -04:00
Thomas Chou
545dfd1014 env: export fdt_blob to the environment variable
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>
2015-10-23 09:42:28 -06:00
Simon Glass
5692ccfaca x86: video: Allow keyboard presence to be controlled by device tree
At present a VGA console assumes a keyboard unless a CONFIG option is set.
This difference can be dealt with by a device tree option, allowing boards
that are otherwise the same to use the same configuration.

Signed-off-by: Simon Glass <sjg@chromium.org>
2015-04-16 19:27:40 -06:00
Simon Glass
d18926af30 fdt: Rename the DEV_TREE_BIN Makefile flag to to EXT_DTB
This seems like a better name. This is a patch-up to the earlier commit
63b4b5b, and also removes a redundant Makefile change.

Signed-off-by: Simon Glass <sjg@chromium.org>
2014-06-19 11:18:56 -04:00
Simon Glass
63b4b5bae5 fdt: Add DEV_TREE_BIN option to specify a device tree binary file
In some cases, an externally-built device tree binary is required to be
attached to U-Boot. An example is when using image signing, since in that
case the .dtb file must include the public keys.

Add a DEV_TREE_BIN option to the Makefile, and update the documentation.

Usage is something like:

	make DEV_TREE_BIN=boot/am335x-boneblack-pubkey.dtb

Signed-off-by: Simon Glass <sjg@chromium.org>
2014-06-11 16:25:46 -04:00
Jon Loeliger
5f65826b1b FDT: Fix DTC repository references
The Device Tree Compiler (DTC) used to have its master
repository located on jdl.com.  While it is still there,
its official, new, shiny location is on kernel.org here:

    git://git.kernel.org/pub/scm/utils/dtc/dtc.git

Update a few references to point there instead.

Signed-off-by: Jon Loeliger <jdl@jdl.com>
Acked-by: Simon Glass <sjg@chromium.org>
2014-06-05 14:44:56 -04:00
Stephen Warren
065202803d config: don't define CONFIG_ARCH_DEVICE_TREE
Now that nothing uses CONFIG_ARCH_DEVICE_TREE, stop defining it.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
2013-08-02 18:30:11 -04:00
Wolfgang Denk
1a4596601f Add GPL-2.0+ SPDX-License-Identifier to source files
Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
2013-07-24 09:44:38 -04:00
Simon Glass
134a65124d Add minor updates to README.fdt-control
A few things have changed since this doc was written, so update it to
match the current state of things.

Signed-off-by: Simon Glass <sjg@chromium.org>
2013-05-14 15:37:24 -04:00
Simon Glass
f828bf25fe sandbox: Add CONFIG_OF_HOSTFILE to read FDT from host file
With sandbox it is tricky to add an FDT to the image at build time (or
later) since we build an ELF file, not a plain binary, and the address
space of the whole U-Boot is not accessible in the emulated memory map
of sandbox.

Sandbox can read files directly from the host, though, so add an option
to read an FDT from a host file on start-up.

Signed-off-by: Simon Glass <sjg@chromium.org>
2013-05-01 11:17:21 -04:00
Jagannadha Sutradharudu Teki
74de8c9a16 dts/Makefile: Build the user specified dts
This patch provides a support to build the user specified dts.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Acked-by: Simon Glass <sjg@chromium.org>
2013-04-02 16:23:34 -04:00
Simon Glass
eea63e05d0 fdt: ARM: Add fdtcontroladdr to set device tree address in environment
This adds support for a new environment variable called 'fdtcontroladdr'. If
defined, the hex address is used as the address of the control fdt for U-Boot.

Note: I have not changed CONFIG_PRAM section as I already have an
outstanding patch on that.

Signed-off-by: Simon Glass <sjg@chromium.org>
2011-10-26 21:40:16 +02:00
Simon Glass
bbb0b128c3 fdt: Add support for embedded device tree (CONFIG_OF_EMBED)
This new option allows U-Boot to embed a binary device tree into its image
to allow run-time control of peripherals. This device tree is for U-Boot's
own use and is not necessarily the same one as is passed to the kernel.

The device tree compiler output should be placed in the $(obj)
rooted tree. Since $(OBJCOPY) insists on adding the path to the
generated symbol names, to ensure consistency it should be
invoked from the directory where the .dtb file is located and
given the input file name without the path.

This commit contains my entry for the ugliest Makefile / shell interaction
competition.

Signed-off-by: Simon Glass <sjg@chromium.org>
2011-10-26 21:38:59 +02:00