clearfog: Implement USB booting
Here's how to load this from a possible bricked device:
1) Set the boot switches to 01001 (yes, it's different from what the doc
says)
2) Load the bootloader via UART, e.g.:
`./tools/kwboot -b ./u-boot-spl.kwb -t -p /dev/ttyUSB0`
3) Interrupt U-Boot's autoboot to get a prompt
4) Plug a USB flash with images/usb-flash.img loaded
5) One on the U-Boot prompt, execute:
`usb start; fatload usb 0:1 00800000 usb-boot.scr; source 00800000`
6) Get a nice emergency shell
Change-Id: Icef4badc9105bbed78ad949c060c0a46e9ff7f76
diff --git a/board/czechlight/clearfog/copy-boot-scr.sh b/board/czechlight/clearfog/copy-boot-scr.sh
index ff22ebd..88508a4 100755
--- a/board/czechlight/clearfog/copy-boot-scr.sh
+++ b/board/czechlight/clearfog/copy-boot-scr.sh
@@ -1,3 +1,7 @@
#!/bin/sh
install -m 0644 -D $BINARIES_DIR/boot.scr $TARGET_DIR/boot/boot.scr
+
+# Prepare a boot script for USB booting as well
+${HOST_DIR}/bin/mkimage -C none -A arm -T script \
+ -d ${BR2_EXTERNAL_CZECHLIGHT_PATH}/board/czechlight/clearfog/usb-boot.scr.txt ${BINARIES_DIR}/usb-boot.scr