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README: Add instructions for chain-loading U-Boot on jerry

Add instructions for chromebook_jerry.

Signed-off-by: Simon Glass <sjg@chromium.org>
tags/2020-06-01
Simon Glass 4 years ago
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@@ -145,6 +145,76 @@ 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
===========