On 02/19/2014 11:44 AM, Dan Murphy wrote:
> On 02/17/2014 11:56 AM, Dennis Gilmore wrote:
>> Signed-off-by: Dennis Gilmore <den...@ausil.us>
>> diff --git a/include/config_distro_bootcmd.h
>> b/include/config_distro_bootcmd.h
>> +#ifdef CONFIG_CMD_USB
>> +#define BOOTCMD_INIT_USB "run usb_init; "
>> +#define BOOTCMDS_USB \
>> + "usb_init=" \
>> + "if ${usb_need_init}; then " \
>> + "set usb_need_init false; " \
>> + "usb start 0; " \
>> + "fi\0" \
>> + \
>> + "usb_boot=" \
>> + "setenv devtype usb; " \
>> + BOOTCMD_INIT_USB \
>> + "if usb dev ${devnum}; then " \
>
> This may have already been highlighted but I don't see where the kernel
> command line arguments can be set.
> If you have the file system on the USB stick won't you need to direct the
> root to the stick?
They would be set in boot.scr or extlinux.cfg on the disk that the
system boots from; the kernel cmdline is part of the OS that's installed
there, not part of U-Boot. This is why these boot scripts load a
script/config-file from the disk which in turn defines which
kernel/DTB/cmdline to use, rather than directly loading a kernel and
DTB. This approach should even be suitable for booting a non-Linux-OS,
with suitable commands in boot.scr.
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