[U-Boot] [RFC PATCH 1/3] add file with a default boot environment based heavily on Stephen Warrens recent tegra work.

[Dan Murphy]

On 02/19/2014 12:48 PM, Stephen Warren wrote:
> 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 <dennis at 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.

But shouldn't the config file just be an override?

I don't know if we should be having to need to load a boot.scr or any config file just to get the kernel to boot.

If no config file exists should we not try to default to a known good default tested case?

Dan

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Dan Murphy