[U-Boot-Users] boot linux from memory

[Xuezhang Dong]

I have u-boot work with memory only (my flash driver doesnot work yet),
so I try to load linux to memory and give a try, but I find uImage have
40 bytes header, how I can boot linux by using u-boot command-line? Do I
misunderstand something here?

Following is what I did:
==================================================
BRCM5001 # loadb 06008000
BRCM5001 # md 06008000
06008000: 27051956 39440bb6 43d6c107 000a01a8    '..V9D..C.......
06008010: 06008000 06008000 73966e28 05020200    ........s.n(....
06008020: 4c696e75 782d322e 362e3135 00000000    Linux-2.6.15....
06008030: 00000000 00000000 00000000 00000000    ................
06008040: e1a00000 e1a00000 e1a00000 e1a00000    ................
06008050: e1a00000 e1a00000 e1a00000 e1a00000    ................
06008060: ea000002 016f2818 00000000 000a01a8    .....o(.........
06008070: e1a07001 e3a08000 e10f2000 e3120003    ..p....... .....
06008080: 1a000001 e3a00017 ef123456 e10f2000    ..........4V.. .
06008090: e38220c0 e121f002 ee110f10 e3800080    .. ..!..........
060080a0: ee010f10 00000000 00000000 00000000    ................
060080b0: 00000000 00000000 00000000 00000000    ................
060080c0: e28f00c8 e890307e e0500001 0a00000a    ......0~.P......
060080d0: e0855000 e0866000 e08cc000 e0822000    ..P...`....... .
060080e0: e0833000 e08dd000 e5961000 e0811000    ..0.............
060080f0: e4861004 e156000c 3afffffa e3a00000    .....V..:.......
==================================================
If I try to boot from 06008000, I got following:
BRCM5001 # bootm 06008000                         
## Booting image at 06008000 ...                                
   Image Name:   Linux-2.6.15                             
   Image Type:   ARM Linux Kernel Image (uncompressed)

   Data Size:    655784 Bytes = 640.4 kB

   Load Address: 06008000                         
   Entry Point:  06008000                         
   Verifying Checksum ... OK                            
   XIP Kernel Image ... OK                          

Starting kernel ...                   

undefined instruction                     
pc : [<06008004>]          lr : [<06f8c324>]

sp : 06f3fb58  ip : 00000001     fp : 00000002

r10: 00000002  r9 : 06f3fcf4     r8 : 06f3ffdc

r7 : 06f9082c  r6 : 06f8d744     r5 : 06f9082c  r4 : 00000000

r3 : 06008000  r2 : 00000100     r1 : 000001c4  r0 : 00000000

Flags: nZCv  IRQs off  FIQs off  Mode SVC_32as for 'help'

auto
Resetting CPU ...   
==================================================
If I try to jump the header, I got following:
BRCM5001 # go 06008040
## Starting application at 0x06008040 ...
Uncompressing Linux............................................. done,
booting t
he kernel.

Thanks for any advice.

Regards.
Xuezhang.