uClinux-dist added to buildroot guide

hi hippo:

You added boa, net-snmp, dhcp in your new toolschain.It is very helpful.

Thank you.I will try it in my cyclone1c20 dvb later.

Hi hippo,

First, many thanks for your excellent buildroot guide. My toolchain built just fine, so I compiled a (minimal) uClinux kernel. Unfortunately it fails to boot....

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Linux version 2.6.11-uc0 (hootsmon@ce00205) (gcc version 3.4.5)# 3 Thu Feb 16 17:2 9:58 EST 2006

uClinux/Nios II

Altera Nios II support © 2004 Microtronix Datacom Ltd.

Built 1 zonelists

Kernel command line:

PID hash table entries: 128 (order: 7, 2048 bytes)

Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)

Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)

Memory available: 15232k/16384k RAM, 0k/0k ROM (836k kernel code, 139k data)

Mount-cache hash table entries: 512 (order: 0, 4096 bytes)

NET: Registered protocol family 16

Serial: JTAG UART driver $Revision: 1.4 $

ttyJ0 at MMIO 0x821208b0 (irq = 1) is a jtag_uart

io scheduler noop registered

io scheduler deadline registered

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)[/b]

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Looks like I haven&#39;t got a filesystem yet? Can anyone help pls?

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originally posted by jdhar@Feb 17 2006, 11:44 PM

your problem is definitely lack of initramfs... check out the post, and make sure you generate your filesystem correctly, with the appropriate device nodes in /dev (you need to be root to do this)!

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Hi Jdhar,

I updated the initamfs config, add a text file ~/download/rootfs_list for the list of /dev nodes and the /init link, so that a root login is not required now.

I struggled to get uClinux working with INITRAMFS, but eventually I had to admit defeat :-( A pity, because initramfs sounds good.

But some good news is I have managed to boot uClinux with ROMFS, so at least I have a useable development platform now. And it proves the toolchain is OK.

Many thanks to hippo and jdhar for your help.

Never give up. I did struggle a lots before I sucessed with initramfs, because it was new to uClinux.

Check your kernel&#39;s .config, it should have,

CONFIG_INITRAMFS_SOURCE="~/rootfs ~/download/rootfs_list"

Build the kernel, and show me the file, ~/linux-2.6.x/usr/initramfs_list .

The file contains a list of what are built into initramfs.

Yeehaa! I have a minimal uClinux working nicely now, complete with initramfs and busybox. Persistence pays off. For the record, I used buildroot snapshot 20060208 this time, and this worked better for me.

Thanks hippo for your generous help.