Hello all,
I have done some searching into the topic of booting from a USB on the BBB,
and have come across two general replies:
1) It's not possible
2) It's possible, but in order to do it you need to have a powered USB hard
drive to do it (wtf?)
I wasn't convinced either of these were factually correct, so I cloned the
u-boot source, and applied the Robert C. Nelson patch set (March, 2016),
and wrote a simple Hush script inside of include/configs/ti_armv7_common.h
Right underneath the regular boot script, I wrote this:
"usb_boot=usb start; " \
"if usb info; then " \
"echo Found USB device, checking if bootable...; " \
"else run boot; " \
"fi; " \
"if test -e usb 0:1 /boot/uEnv.txt; then " \
"echo Bootable partition on USB! booting...; " \
"setenv interface usb; " \
"setenv bootpart 0:1; " \
"else run boot; " \
"fi; " \
"run loadbootenv; " \
"run importbootenv; " \
"setenv cmdline ${cmdline} root=/dev/sda1; " \
"echo Loaded boot environment from USB.; " \
"if test -n ${cape}; then " \
"if test -e ${interface} ${bootpart} ${fdtdir}/${fdtbase}-${cape}.dtb; then
" \
"setenv fdtfile ${fdtbase}-${cape}.dtb; " \
"fi; " \
"echo using: $fdtfile...; " \
"fi; " \
"echo Checking if uenvcmd is set ...;" \
"if test -n ${uenvcmd}; then " \
"gpio set 56; " \
"echo Running uenvcmd ...;" \
"run uenvcmd; " \
"fi; " \
"echo checking for boot script; " \
"if test -e ${interface} ${bootpart} /boot/${script}; then " \
"gpio set 55;" \
"setenv scriptfile /boot/${script};" \
"run loadbootscript;" \
"echo Loaded script from ${scriptfile};" \
"gpio set 56; " \
"run bootscript;" \
"fi; " \
"echo Running uname_boot; " \
"run uname_boot;\0" \
Forgive me for the leading/trailing quotation marks, they're necessary to
get it to work inside of those header files (all of the default scripts are
written in-line as #define's).
After implementing that, I changed BOOTENV_DEV_LEGACY_MMC to run usb_boot
instead of boot, and it seems to work like a charm.
My question to you is this:
Is there a better way to do it that you know of? If not, is this a good way
to do it?
-Fred
--
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