[U-Boot] u-boot USB question

Bo Shen
2013-05-17T03:04:14Z

Hi Lance,

On 5/17/2013 10:20, Lance Beck wrote:
> Thanks Bo!
>
> My thinking with fw_printev (setenv) was that I would use it to set the environment variables from our user space app. This way, we can control when the USB stick will be used for a kernel or rootfs upgrade. Any thoughts on show this could be scripted and run? We would like to be able to have a customer in the field do this without having to do anything but send a command from the user app, insert the USB drive and reboot.

Maybe you can test reference in <include/configs/am3517_evm.h>
---8>---
#define CONFIG_EXTRA_ENV_SETTINGS \
"loadaddr=0x82000000\0" \
"console=ttyO2,115200n8\0" \
"mmcdev=0\0" \
"mmcargs=setenv bootargs console=${console} " \
"root=/dev/mmcblk0p2 rw rootwait\0" \
"nandargs=setenv bootargs console=${console} " \
"root=/dev/mtdblock4 rw " \
"rootfstype=jffs2\0" \
"loadbootscript=fatload mmc ${mmcdev} ${loadaddr} boot.scr\0" \
"bootscript=echo Running bootscript from mmc ...; " \
"source ${loadaddr}\0" \
"loaduimage=fatload mmc ${mmcdev} ${loadaddr} uImage\0" \
"mmcboot=echo Booting from mmc ...; " \
"run mmcargs; " \
"bootm ${loadaddr}\0" \
"nandboot=echo Booting from nand ...; " \
"run nandargs; " \
"nand read ${loadaddr} 280000 400000; " \
"bootm ${loadaddr}\0" \

#define CONFIG_BOOTCOMMAND \
"mmc dev ${mmcdev}; if mmc rescan; then " \
"if run loadbootscript; then " \
"run bootscript; " \
"else " \
"if run loaduimage; then " \
"run mmcboot; " \
"else run nandboot; " \
"fi; " \
"fi; " \
"else run nandboot; fi"
---<8---

Best Regards,
Bo Shen