doc: Convert Chromium OS docs to rst

Move this documentation over to reST. Move the example files into a files/
directory so they are still separate.

Do a few minor updates while we are here:
- Tidy up sandbox build instructions
- Update my github account name
- Add some talks and links

Signed-off-by: Simon Glass <sjg@chromium.org>

1 files changed, 0 insertions, 239 deletions

diff --git a/doc/README.chromium-chainload b/doc/README.chromium-chainload
deleted file mode 100644
index 45eaece..0000000
--- a/doc/README.chromium-chainload
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-Running U-Boot from coreboot on Chromebooks
-===========================================
-
-U-Boot can be used as a secondary boot loader in a few situations such as from
-UEFI and coreboot (see README.x86). Recent Chromebooks use coreboot even on
-ARM platforms to start up the machine.
-
-This document aims to provide a guide to booting U-Boot on a Chromebook. It
-is only a starting point, and there are many guides on the interwebs. But
-placing this information in the U-Boot tree should make it easier to find for
-those who use U-Boot habitually.
-
-Most of these platforms are supported by U-Boot natively, but it is risky to
-replace the ROM unless you have a servo board and cable to restore it with.
-
-
-For all of these the standard U-Boot build instructions apply. For example on
-ARM:
-
-   sudo apt install gcc-arm-linux-gnueabi
-   mkdir b
-   make O=b/nyan_big CROSS_COMPILE=arm-linux-gnueabi- nyan-big_defconfig all
-
-You can obtain the vbutil_kernel utility here:
-
-   https://drive.google.com/open?id=0B7WYZbZ9zd-3dHlVVXo4VXE2T0U
-
-
-Snow (Samsung ARM Chromebook)
------------------------------
-
-See here:
-
-https://www.chromium.org/chromium-os/firmware-porting-guide/using-nv-u-boot-on-the-samsung-arm-chromebook
-
-
-Nyan-big
---------
-
-Compiled based on information here:
-https://lists.denx.de/pipermail/u-boot/2015-March/209530.html
-https://git.collabora.com/cgit/user/tomeu/u-boot.git/commit/?h=nyan-big
-https://lists.denx.de/pipermail/u-boot/2017-May/289491.html
-https://github.com/chromeos-nvidia-androidtv/gnu-linux-on-acer-chromebook-13#copy-data-to-the-sd-card
-
-1. Build U-Boot
-
-   mkdir b
-   make -j8 O=b/nyan-big CROSS_COMPILE=arm-linux-gnueabi- nyan-big_defconfig all
-
-
-2. Select a .its file
-
-Select something from doc/chromium which matches your board, or create your
-own.
-
-Note that the device tree node is required, even though it is not actually
-used by U-Boot. This is because the Chromebook expects to pass it to the
-kernel, and crashes if it is not present.
-
-
-3. Build and sign an image
-
-   ./b/nyan-big/tools/mkimage -f doc/chromium/nyan-big.its u-boot-chromium.fit
-   echo test >dummy.txt
-   vbutil_kernel --arch arm --keyblock doc/chromium/devkeys/kernel.keyblock \
-	--signprivate doc/chromium/devkeys/kernel_data_key.vbprivk \
-	--version 1 --config dummy.txt --vmlinuz u-boot-chromium.fit \
-	--bootloader dummy.txt --pack u-boot.kpart
-
-
-4. Prepare an SD card
-
-   DISK=/dev/sdc   # Replace with your actual SD card device
-   sudo cgpt create $DISK
-   sudo cgpt add -b 34 -s 32768 -P 1 -S 1 -t kernel $DISK
-   sudo cgpt add -b 32802 -s 2000000 -t rootfs $DISK
-   sudo gdisk $DISK   # Enter command 'w' to write a protective MBR to the disk
-
-
-5. Write U-Boot to the SD card
-
-   sudo dd if=u-boot.kpart of=/dev/sdc1; sync
-
-
-6. Start it up
-
-Reboot the device in dev mode. Make sure that you have USB booting enabled. To
-do this, login as root (via Ctrl-Alt-forward_arrow) and type
-'enable_dev_usb_boot'. You only need to do this once.
-
-Reboot the device with the SD card inserted. Press Clrl-U at the developer
-mode screen. It should show something like the following on the display:
-
-   U-Boot 2017.07-00637-g242eb42-dirty (May 22 2017 - 06:14:21 -0600)
-
-   Model: Acer Chromebook 13 CB5-311
-   Board: Google/NVIDIA Nyan-big, ID: 1
-
-   Net:   No ethernet found.
-   Hit any key to stop autoboot:  0
-   Tegra124 (Nyan-big) #
-
-
-7. Known problems
-
-On the serial console the word MMC is chopped at the start of the line:
-
-C:   sdhci@700b0000: 2, sdhci@700b0400: 1, sdhci@700b0600: 0
-
-This is likely due to some problem with change-over of the serial driver
-during relocation (or perhaps updating the clock setup in board_init()).
-
-
-9. Notes
-
-To check that you copied the u-boot.its file correctly, use these commands.
-You should see that the data at 0x100 in u-boot-chromium.fit is the first few
-bytes of U-Boot:
-
-   hd u-boot-chromium.fit |head -20
-   ...
-   00000100  b8 00 00 ea 14 f0 9f e5  14 f0 9f e5 14 f0 9f e5  |................|
-
-   hd b/nyan-big/u-boot.bin |head
-   00000000  b8 00 00 ea 14 f0 9f e5  14 f0 9f e5 14 f0 9f e5  |................|
-
-
-The 'data' property of the FIT is set up to start at offset 0x100 bytes into
-the file. The change to CONFIG_SYS_TEXT_BASE is also an offset of 0x100 bytes
-from the load address. If this changes, you either need to modify U-Boot to be
-fully relocatable, or expect it to hang.
-
-
-chromebook_jerry
-----------------
-
-The instruction are similar to those for Nyan with changes as noted below:
-
-1. Patch U-Boot
-
-Open include/configs/rk3288_common.h
-
-Change:
-
-#define CONFIG_SYS_TEXT_BASE		0x00100000
-
-to:
-
-#define CONFIG_SYS_TEXT_BASE		0x02000100
-
-
-
-2. Build U-Boot
-
-   mkdir b
-   make -j8 O=b/chromebook_jerry CROSS_COMPILE=arm-linux-gnueabi- \
-	chromebook_jerry_defconfig all
-
-
-3. See above
-
-4. Build and sign an image
-
-   ./b/chromebook_jerry/tools/mkimage -f doc/chromium/chromebook_jerry.its \
-	u-boot-chromium.fit
-   echo test >dummy.txt
-   vbutil_kernel --arch arm --keyblock doc/chromium/devkeys/kernel.keyblock \
-	--signprivate doc/chromium/devkeys/kernel_data_key.vbprivk \
-	--version 1 --config dummy.txt --vmlinuz u-boot-chromium.fit \
-	--bootloader dummy.txt --pack u-boot.kpart
-
-
-5. See above
-
-6. See above
-
-7. Start it up
-
-Reboot the device in dev mode. Make sure that you have USB booting enabled. To
-do this, login as root (via Ctrl-Alt-forward_arrow) and type
-'enable_dev_usb_boot'. You only need to do this once.
-
-Reboot the device with the SD card inserted. Press Clrl-U at the developer
-mode screen. It should show something like the following on the display:
-
-   U-Boot 2017.05-00649-g72acdbf-dirty (May 29 2017 - 14:57:05 -0600)
-
-   Model: Google Jerry
-   Net:   Net Initialization Skipped
-   No ethernet found.
-   Hit any key to stop autoboot:  0
-
-
-8. Known problems
-
-None as yet.
-
-
-9. Notes
-
-None as yet.
-
-
-Other notes
-===========
-
-flashrom
---------
-
-   Used to make a backup of your firmware, or to replace it.
-
-   See: https://www.chromium.org/chromium-os/packages/cros-flashrom
-
-
-coreboot
---------
-
-Coreboot itself is not designed to actually boot an OS. Instead, a program
-called Depthcharge is used. This originally came out of U-Boot and was then
-heavily hacked and modified such that is is almost unrecognisable. It does
-include a very small part of the U-Boot command-line interface but is not
-usable as a general-purpose boot loader.
-
-In addition, it has a very unusual design in that it does not do device init
-itself, but instead relies on coreboot. This is similar to (in U-Boot) having
-a SPI driver with an empty probe() method, relying on whatever was set up
-beforehand. It can be quite hard to figure out between these two code bases
-what settings are actually used. When chain-loading into U-Boot we must be
-careful to reinit anything that U-Boot expects. If not, some peripherals (or
-the whole machine) may not work. This makes the process of chainloading more
-complicated than it could be on some platforms.
-
-Finally, it supports only a subset of the U-Boot's FIT format. In particular
-it uses a fixed address to load the FIT and does not support load/exec
-addresses. This means that U-Boot must be able to boot from whatever
-address Depthcharge happens to use (it is the CONFIG_KERNEL_START setting
-in Depthcharge). In practice this means that the data in the kernel@1 FIT node
-(see above) must start at the same address as U-Boot's CONFIG_SYS_TEXT_BASE.