[UBoot] Hows to boot Linux Kernel from USB

[UBoot] Hows to boot Linux Kernel from USB

[thaoth]

Hi All,

I would like to know how to boot linux kernel from USB. I have 
ported UBoot
(support serial, USB driver) but didn't support CF card. 

Would you please tell me how to boot Linux Kernel from USB Flash memory? 
I have
many guide could help hows to boot Linux kernel from CF card or network 
but  I
didn't see help for USB Flash memory.

Here is step by step I did but didn't work.
- First initialization USB

=> usb start

- List file on USB Flash memory

=> fatls usb 0:1
  3876248   vmlinux.srec
  1348231   vmlinux
  2207942   vmlinux.bin
.
  1277956   zimage

- load zImage into SDRAM memory at base address 0x8c000000 + 200000 

=> fatload usb 0:1 200000 zimage
reading zimage
.
.
.
.
......................................................
..........................
............................................

1277956 bytes read

=> bootm
Wrong Image Format for bootm command
ERROR: can't get kernel image!

This seems here is wrong command. I should load uImage (not zImage) 
into SDRAM
memory. Google booting kernel from USB on the internet but I 
didn't see any help. :(

Thank you for answer
Best regards,

Re: [UBoot] Hows to boot Linux Kernel from USB

[Paul Mundt]

On Tue, Sep 30, 2008 at 11:30:09AM +0000, thaoth wrote:
> => usb start
> 
> - List file on USB Flash memory
> 
> => fatls usb 0:1
>   3876248   vmlinux.srec
>   1348231   vmlinux
>   2207942   vmlinux.bin
> .
>   1277956   zimage
> 
> - load zImage into SDRAM memory at base address 0x8c000000 + 200000 
> 
> => fatload usb 0:1 200000 zimage
> reading zimage
> .
> .
> .
> .
> ......................................................
> ..........................
> ............................................
> 
> 1277956 bytes read
> 
> => bootm
> Wrong Image Format for bootm command
> ERROR: can't get kernel image!
> 
> This seems here is wrong command. I should load uImage (not zImage) 
> into SDRAM
> memory. Google booting kernel from USB on the internet but I 
> didn't see any help. :(
> 
You can certainly boot the zImage from SDRAM. Once it's loaded, you can
just 'go <load address>' and hit the decompressor. The uImage tends to be
handier in that it has more information on hand, but there is nothing
stopping you from using other formats.