Hi
This step was pretty pointless...
host > dd if=/dev/ram0 bs=1k count=8192 | gzip -v9 > ramdisk.gz
the next thing you do is unpack it again.
host > gunzip ramdisk.gz
host > mount -o loop ramdisk mnt/
host > mkdir mnt/usr ; mkdir mnt/home ; mkdir mnt/home/jlong ;
mkdir mnt/dev ; mkdir mnt/etc
host > umount mnt
You have no root filesystem merely usr home dev & etc directories. How
exactly is the system supposed to boot as there are no executables! Can
you try the ramdisk image that ships with the LSP. I forget exactly
where it is located.
Did you make sure the kernel understands ext2? Can you boot your kernel
& check by looking for ext2 in the /proc/filesystems file.
Regards
Phil Q
James T Long wrote:
Morning all,
I am having trouble getting Linux (MonteVista 2.6.10) to boot. It's
failing to create a file-system.
My target board is a stand-alone DaVinci 6446, with only RS-232,
NAND-Flash, DDR-2 and Ethernet.
I can get Ethernet running while in U-Boot so I can load the kernel,
but Ethernet won't work
while Linux is trying to boot. (I had to disable the ethernet in
Linux, because DHCP would
timeout and fail.)
I'm trying to create a RAMDISK, but Linux is rejecting it. See end of
page for the error message.
Please help on what I'm doing wrong. If there is a better strategy,
please let me know.
Thank you for your help.
James Long
I've done the following, based mostly on Wiki pages.
On my Linux PC, I modified menuconfig, like so, and then did a clean
build:
CONFIG_MTD=y
CONFIG_MTD_PARTITIONS=y
CONFIG_MTD_CHAR=y
CONFIG_MTD_BLKDEVS=y
CONFIG_MTD_BLOCK=y
CONFIG_MTD_NAND=y
CONFIG_MTD_NAND_VERIFY_WRITE=y
CONFIG_MTD_NAND_IDS=y
CONFIG_MTD_NAND_DAVINCI=y
CONFIG_YAFFS_FS=y
CONFIG_YAFFS_YAFFS1=y
CONFIG_YAFFS_YAFFS2=y
CONFIG_YAFFS_AUTO_YAFFS2=y
CONFIG_YAFFS_SHORT_NAMES_IN_RAM=y
On my Linux PC, logged in as superuser, I created a 8Meg RAMDISK, like
so:
host > cd /tftpboot
host > dd if=/dev/zero of=/dev/ram0 bs=1k count=8192
host > mke2fs -vm0 /dev/ram0 8192
host > tune2fs -c 0 /dev/ram0
host > dd if=/dev/ram0 bs=1k count=8192 | gzip -v9 > ramdisk.gz
host > mkdir mnt
host > gunzip ramdisk.gz
host > mount -o loop ramdisk mnt/
host > mkdir mnt/usr ; mkdir mnt/home ; mkdir mnt/home/jlong ;
mkdir mnt/dev ; mkdir mnt/etc
host > umount mnt
host > gzip -v9 ramdisk
Then, from U-Boot, I load and burn the kernel and ramdisk.gz.
UBOOT # dhcp 0x80700000 192.186.0.100:/tftpboot/uImage
UBOOT # nand erase 0x100000 0x150000
UBOOT # nand write 0x80700000 0x100000 0x150000
UBOOT # tftp 0x87000000 ramdisk.gz
UBOOT # nand erase 0x280000 0x20000
UBOOT # nand write 0x87000000 0x280000 0x20000
UBOOT # setenv bootcmd 'nand read 0x87000000 0x280000 0x20000;
nboot 80700000 0 100000; bootm'
UBOOT # setenv bootargs console=ttyS0,115200n8 root=/dev/ram0 rw
initrd=0x87000000,8M
ip=192.168.0.103:255.255.255.0:192.168.0.1:192.168.0.1:192.168.0.100:off
mem=120M
UBOOT # saveenv
When I power-cycle, I get the following (On the second line, I added a
printf of the two magic numbers being compared):
RAMDISK: Compressed image found at block 0
EXT3-fs: Magic mismatch, very weird ! <00000000 0000ef53>
yaffs: dev is 1048576 name is "ram0"
yaffs: Attempting MTD mount on 1.0, "ram0"
yaffs: dev is 1048576 name is "ram0"
yaffs: Attempting MTD mount on 1.0, "ram0"
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(1,0)
------------------------------------------------------------------------
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