EP440XS board boot problem(Note:similart to Sequoia)

Allan Wang aiyuanwang at yahoo.com
Wed Dec 2 15:22:47 EST 2009

Hello, Mr Denk,

Thank you for your help. My answer to your questions are between the lines. Attached is the dts file I use.

Best regards,


----- Original Message ----
From: Wolfgang Denk <wd at denx.de>
To: Allan Wang <aiyuanwang at yahoo.com>
Cc: linuxppc-dev at lists.ozlabs.org
Sent: Tue, December 1, 2009 6:10:22 PM
Subject: Re: EP440XS board boot problem(Note:similart to Sequoia)

Dear Allan Wang,

In message <401793.31718.qm at web52903.mail.re2.yahoo.com> you wrote:
> I am new to the list. I am still newbie to embedded linux. I have
> bought an ep440xs board which is similar to sequoia board. u-boot is
> working. I am trying to make it run linux. I have the following
> problems and need your help. Thank you very much:

Which exact version of U-Boot are you running on this board?

=> version

U-Boot 1.1.6 (Oct 25 2009 - 13:26:41)

I guess this is a out-of-tree port, i. e. not part of the mainline
U-Boot repository - so are you sure that device tree support is
enabled in your version of U-Boot?

The device tree is not enabled in u-boot. I am building cuImage, so the device tree is supported in kernel(

> I am using linux kernel I encounter 2 problems:
> 1. After console_init() is called inside start_kernel(), the console starts printing garbage like:
> Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
> serial8250.0: ttyS0 at MMIO 0x1ef600300 (irq = 16) is a 16550A
> ������������������������������

What is your exact boot command?

I tftp the cuImage to address 0x200000 and bootm to boot.

Which boot arguments do you pass to the kernel?

bootargs=$(bootargs) console=ttyS0,$(baudrate)

What is ytour console baud rate in U-Boot, and what sort of "console="
boot argument do you pass to the Linux kernel?

The u-boot sets it to 115.2k. the dts file is set to 115.2k. Here is the boot parameter:

What does your device tree look like?

I attached my dts file.

> 2. It pakics when mounting the root file system(NFS):
> (gdb) bt
> #0 panic (fmt=0xc0290e94 "VFS: Unable to mount root fs on %s")

So what is the "%s" argument here? Which sort of root file system are
you trying to mount - NFS, ramdisk, UBIFS, ... ?

I try to use NFS for the root file system.

Best regards,

Wolfgang Denk

DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
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"Sometimes it's because he hasn't had a drink."
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