学步园

U-Boot can't read ext3.

Setting commands for the kernel to boot a rootfstype of ext3 does no good if U-Boot can;t find the kernel in the first place.

Your options are:
1.  Partition your disk to have a boot (ext2) partition and a separate root (ext3) partition and change your boot partitions to match

  2. Do a NAND install using UBIT which does all the hard work for you. (but I would say that seeing as I developed UBIT)

Iam a bit confused 
Why is U-Boot able too boot to my ext3 partition after I excecuted
/usr/sbin/fw_setenv usb_rootfstype ext3  and then reboot?

'rootfstype' is a parameter that is passed to the kernel.  It is only relevant at the point when a kernel has been loaded into memory and is initialising.  If the only place your kernel exists is on an ext3 partition, U-Boot cannot find it and cannot load it
into memory.

Code:
Select all

Loading file "/boot/uImage" from usb device 0:1 (usbda1)
1 bytes read
Found bootable drive on usb 0:1
Loading file "/boot/uImage" from usb device 0:1 (usbda1)
1434220 bytes read
Loading file "/boot/uInitrd" from usb device 0:1 (usbda1)
4736952 bytes read
## Booting kernel from Legacy Image at 00800000 ...
   Image Name:   Linux-2.6.32-5-kirkwood
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1434156 Bytes = 1.4 MiB
   Load Address: 00008000
   Entry Point:  00008000
   Verifying Checksum ... OK
## Loading init Ramdisk from Legacy Image at 01100000 ...
   Image Name:   initramfs-2.6.32-5-kirkwood
   Image Type:   ARM Linux RAMDisk Image (gzip compressed)
   Data Size:    4736888 Bytes = 4.5 MiB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

root@debian:~# mount
rootfs on / type rootfs (rw)
/dev/sda1 on / type ext3 (rw,noatime,errors=remount-ro,data=ordered)

~# df -h
Filesystem            Size  Used Avail Use% Mounted on
rootfs                1.9G  290M  1.5G  17% /
none                   60M   32K   60M   1% /dev
/dev/sda1             1.9G  290M  1.5G  17% /
tmpfs                  62M     0   62M   0% /lib/init/rw
tmpfs                  62M     0   62M   0% /dev/shm
tmpfs                  62M     0   62M   0% /tmp

The OP's question, although ostensibly about booting from ext3 was also about a situation given by a problem with the USB boot medium.

A huge number of booting problems are caused by USB sticks not initialising reliably.

Coopy wrote:Thanks for the reply

Iam a bit confused 
Why is U-Boot able too boot to my ext3 partition after I excecuted
/usr/sbin/fw_setenv usb_rootfstype ext3  and then reboot?

If you printenv in the uBoot prompt of Jeff's uBoot you will see usb_rootfstype only set the rootfs partition type in your attached USB device when booting via USB, it doesn't affect the booting from NAND, so before that you failed to boot from your USB device
after formatted to ext3 is due to the default setting of usb_rootfstype is ext2 and being passed to the kernel.

peaslaker wrote:A huge number of booting problems are caused by USB sticks not initialising reliably.

Coopy seems talking about an external USB hard drive not a stick...