[U-Boot] u-boot USB question

Michael Trimarchi
2013-05-17T03:39:22Z

Hi

On 17/05/13 05:04, Bo Shen wrote:
> 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.
>

If the cpu doesn't have any register for rebooting reason, you can write in environment a variable
that said that you want update at the next reboot and then using and autoscript you can flash it

Michael

> 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
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