[Gumstix-users] Some questions about kernel booting

[Fred H. <bwc...@ya...>]

I have just received my gumstix. Let me see if i have
things correct.  The Uimage it the kernel and the
root_fs_arm is the whole image including all of the
whole file system.  So believing that is correct i
created a new Uimage.  Before I permentaly copy it
over i want to boot it from the mmc. I have looked
through the past posts and found the following:
So,  what I have done for my own kernel testing is:
  1) create a "loadkernel" env variable:
  setenv loadkernel  mmc\; sleep 1\; mmc\; fatload mmc
1 0xa2000000 uimage
 
  2) create a "testkernel" env variable:
  setenv testkernel  run loadkernel\;cp 0x140000
0xa2100000 0x40000\; bootm 0xa2000000
0xa2100000
 
  3) you can check the list of env variables with
"printenv"
  printenv
 
  4) save it to flash
  save
 
 Thereafter, upon reset, you can 
  1) intervene within the 3 seconds by pressing any
key, then
2)type "run testkernel" at the prompt.

Which i do and i get errors of the following sort:
GUM> printenv
bootdelay=2
baudrate=115200
bootargs=console=ttyS0,115200n8 root=1f02
rootfstype=jffs2 reboot=cold,hard
bootcmd=fsload a2000000 boot/uImage;bootm a2000000
stdin=serial
stdout=serial
stderr=serial

Environment size: 196/131068 bytes
GUM> setenv loadkernel  mmc\; sleep 1\; mmc\; fatload
mmc 1 0xa2000000 uimage
GUM> setenv testkernel  run loadkernel\;cp 0x140000
0xa2100000 0x40000\; bootm 0xa2000000 0xa2100000
GUM> run testkernel
No MMC card found
No MMC card found

** Unable to use mmc 1:1 for fatload **
## Booting image at a2000000 ...
Bad Header Checksum

My MMC works fine, when started i can cd to /mnt/mmc
and make and creat files and read exsisting files.

Also once i get this straightened out am i correct in
assuming the easiest way to update kernels is to
replace the /boot/Uimage with the new one i have made?
Thanks a lot





		
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