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Initramfs on AMD DB1550 Board

To: <>
Subject: Initramfs on AMD DB1550 Board
From: "Charles C.K.Lai" <>
Date: Thu, 2 Mar 2006 10:51:02 +0800
Organization: N300 ICL/ITRI
Original-recipient: rfc822;
Reply-to: "Charles C.K.Lai" <>
I downloaded kernel 2.6.14 from Linux-MIPS,
and compiled with gcc-3.4.4 and mipssde-6.02.03 toolchain.
I put the target directory at /init,
run with /init to a text file,
and assigned this text file to the initrd for cpio.
After compiled, loaded, and ran,
I got the message below,
Would someone tell me how to set the root parameter?
Thanks a lot!
Linux version 2.6.14 (gcc version 3.4.4 mipssde-6.02.03-20050626CPU revision is: 03030200
AMD Alchemy Au1550/Db1550 Board
(PRId 03030200) @ 396MHZ
BCLK switching enabled!
Determined physical RAM map:
 memory: 0c000000 @ 00000000 (usable)
Built 1 zonelists
Kernel command line: ln -s /linuxrc /init console=ttyS0,115200
Primary instruction cache 16kB, physically tagged, 4-way, linesize 32 bytes.
Primary data cache 16kB, 4-way, linesize 32 bytes.
Synthesized TLB refill handler (17 instructions).
Synthesized TLB load handler fastpath (34 instructions).
Synthesized TLB store handler fastpath (34 instructions).
Synthesized TLB modify handler fastpath (33 instructions).
PID hash table entries: 1024 (order: 10, 16384 bytes)
calculating r4koff... 00060ae0(396000)
CPU frequency 396.00 MHz
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 187268k/196608k available (1952k kernel code, 9056k reserved, 323k data)Mount-cache hash table entries: 512
Checking for 'wait' instruction...  unavailable.
NET: Registered protocol family 16
Serial: Au1x00 driver
ttyS0 at I/O 0xb1100000 (irq = 0) is a AU1X00_UART
ttyS1 at I/O 0xb1200000 (irq = 8) is a AU1X00_UART
ttyS2 at I/O 0xb1400000 (irq = 9) is a AU1X00_UART
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize
loop: loaded (max 8 devices)
au1000eth version 1.5 Pete Popov <>
eth0: Au1x Ethernet found at 0xb0500000, irq 27
eth0: AMD 79C874 10/100 BaseT PHY at phy address 31
eth0: Using AMD 79C874 10/100 BaseT PHY as default
eth1: Au1x Ethernet found at 0xb0510000, irq 28
eth1: AMD 79C874 10/100 BaseT PHY at phy address 31
eth1: Using AMD 79C874 10/100 BaseT PHY as default
mice: PS/2 mouse device common for all mice
NET: Registered protocol family 2
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 3, 32768 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
TCP bic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
NET: Registered protocol family 15
VFS: Cannot open root device "<NULL>" or unknown-block(1,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)
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