ramdisk may be bring more trouble ,and now i use the cramfs more effetive
To: [email protected]: [email protected]: Fri, 19 Dec 2008
10:04:11 -0600CC: [email protected]: Re:
Trying to boot with a RAMDISKGood morning, all. Thanks, Josh and Phil for your
replies. Turns out that when I was given the Linux PC a few months ago,
several things were not properly installed. There wasn't a ramdisk in my
directory structure, but when I went back and searched for it (amazing what you
can find when you know to look for them!), I found a ramdisk.gz file. I'm now
booting the linux kernel. YAYAY. A couple of things, as a follow-on. Josh, I
didn't want to remove the DHCP from the compilation, totally, because when I'm
troubleshooting boards in the lab, I will want it, and I didn't want to change
the compiler, just the environment vars. I got the bootarg setting (to disable
the DHCP) directly from an e-mail from my Texas Instruments contact. It works,
but I think there is still a minor syntax error. If you can remember about the
command line args, please let me know. Thanks. Phil, I knew when I was typing
it, that gzip followed by zip wasn't needed, but I was doing a cut&paste from a
wiki page. I'm guessing, but it appears to be there mostly as a logic break,
so that you can make mulitple rep's of the unzip-mount-mkdir-unmount-zip, as
needed in the future. Anyway, real follow-up question is: If for whatever
reason I want to do the whole "build ramdisk" in the future, what files do I
need to add? The same wiki page that said "Create whatever directories you
want" also made a reference to 'busybox' (but not being a unix/linus type, I've
never used it). Would that be sufficient? It's not on my Linux PC, so I would
assume from the Net? Hidden on one of the DVEVM install disks? Again, thank
you both for you help. Major progress in a single afternoon!!! Regards, James
Long When I wanted to remove the very long time delay from DHCP (because I’m
using a static IP address) I only removed DHCP from the kernel compilation and
not the entire Ethernet. There is also a way I’ve seen mentioned on this list
on how to not have it check DHCP from the command line arguments to the kernel
but I have forgotten it. I know that doesn’t answer your question at hand but
it’s something you can try later. Josh
Phil Quiney <[email protected]>
12/18/2008 12:52 PM
To
James T Long <[email protected]>
cc
[email protected]
Subject
Re: Trying to boot with a RAMDISK
HiThis step was pretty pointless... host > dd if=/dev/ram0 bs=1k count=8192
| gzip -v9 > ramdisk.gzthe 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 mntYou 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.RegardsPhil
QJames 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)>>------------------------------------------------------------------------>>_______________________________________________>Davinci-linux-open-source
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