[U-Boot] Problems booting PPC with RAM root fs
Adam Moskowitz
adamm at menlo.com
Thu Jun 10 19:34:38 CEST 2010
Here's my situation . . . We have a custom PPC-based board that
currently boots from a kernel in the on-board flash and the root fs
mounted via NFS. My project is to move the root fs into flash; to test
that -- mainly to save time and write cycles on the flash -- I'm trying
to do my debugging by pulling the root fs into RAM using TFTP then boot
from that. of course, it's not working.
Here's a summary of how I got this far: I created a file with dd,
formatted it with mke2fs, mounted it (-o loop), copied in a known
working root fs), unmounted, gzipped, then ran mkimage as follows:
mkimage \
-n "RAMdisk image" \
-A PPC \
-O linux \
-T ramdisk \
-C gzip \
-d ext2-image.gz \
uboot-image
Here's how I tried to boot the system:
U-Boot 1.1.4 (May 20 2008 - 16:49:25)
. . .
=> setenv netmask 255.255.255.252
=> setenv gatewayip 10.3.0.33
=> setenv ipaddr 10.3.0.34
=> setenv serverip 10.255.8.1
=> tftp 0x4000000 testlab/uboot-image
(tftp results)
done!
Bytes transferred = 10014657 (98cfc1 hex)
=> setenv bootargs console=ttl0,19200,root=/dev/ram,load_ramdisk=1
=> bootm 0xFC040000 0x4000000
[
a complete log of the boot session appears below
(just in case attachments don't work)
]
The system uncompresses and recognizes the kernel and the rootfs, but
fails because for some reason, it's trying to load the root fs via NFS,
even though I thought I told it not to do that.
I hope this is as simple as I don't have the right kernel command line
args, but I'm at a loss for which args to give it to fix this.
If anyone can please point me in the right direction, I'd really
appreciate it.
Thanks,
Adam
----- typescript of boot session starts here -----
Reset cause: Powerup
This is build nodebd3.1.12
Initializing ECC ... RAM initialized
Jumping to U-Boot...
U-Boot 1.1.4 (May 20 2008 - 16:49:25)
I2C: ready
DRAM: 128 MB
FLASH: 32 MB
Found mac: 00:18:17:10:00:cd
ethaddr 00:18:17:10:00:cd
Hit any key to stop autoboot: 3 2 0
=> setenv netmask 255.255.255.252
=> setenv gatewayip 10.3.0.33
=> setenv ipaddr 10.3.0.34
=> setenv serverip 10.255.8.1
=> tftp 0x4000000 testlab/uboot-image
Ethernet clock acquiring lock... done
PHY Hard Reset.
setup_phy: PHY found at address 0
setup_phy: PHY found at address 1
XLLTemac_PhyInit: Vitesse 8201 PHY at 1 configured
Waiting for link... link up
Waiting for DCM lock... locked
Speed: 1000Mb, Full duplex
TFTP from server 10.255.8.1; our IP address is 10.3.0.34; sending through gateway 10.3.0.33
Filename 'testlab/uboot-image'.
Load address: 0x4000000
Loadingg: *#################################################################
#################################################################
(line repeats 29 times)
######
done!
Bytes transferred = 10014657 (98cfc1 hex)
=> setenv bootargs console=ttl0,19200,root=/dev/ram,load_ramdisk=1
=> bootm 0xFC040000 0x4000000
## Booting image at fc040000 ...
Image Name: Linux-2.4.20_mvl31-ml300
Image Type: PowerPC Linux Kernel Image (gzip compressed)
Data Size: 633621 Bytes = 618.8 kB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Uncompressing Kernel Image from src 0xfc040040 to dest 0x0..OK
## Loading RAMDisk Image at 04000000 ...
Image Name: RAMdisk image for adam
Image Type: PowerPC Linux RAMDisk Image (gzip compressed)
Data Size: 10014593 Bytes = 9.6 MB
Load Address: 00000000
Entry Point: 00000000
Verifying Checksum ... OK
Loading Ramdisk to 07627000, end 07fb3f81 ... OK
Linux version 2.4.20_mvl31-ml300 (dradbin at drdws009.nyc.deshaw.com) (gcc version 3.3.6) #1 Tue Jul 7 16:43:48 EDT 2009
Xilinx Virtex-II Pro port (C) 2002 MontaVista Software, Inc. (source at mvista.com)
On node 0 totalpages: 32768
zone(0): 32768 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: console=ttl0,19200,root=/dev/ram,load_ramdisk=1
Xilinx INTC #0 at 0x000003F0 (DCR)
Calibrating delay loop... 299.00 BogoMIPS
Memory: 118208k available (1092k kernel code, 384k data, 60k init, 0k highmem)
Dentry cache hash table entries: 16384 (order: 5, 131072 bytes)
Inode cache hash table entries: 8192 (order: 4, 65536 bytes)
Mount-cache hash table entries: 2048 (order: 2, 16384 bytes)
Buffer-cache hash table entries: 8192 (order: 3, 32768 bytes)
Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
LSP Revision 42
ikconfig 0.5 with /proc/ikconfig
Starting kswapd
devfs: v1.12c (20020818) Richard Gooch (rgooch at atnf.csiro.au)
devfs: boot_options: 0x1
pty: 256 Unix98 ptys configured
RAMDISK driver initialized: 16 RAM disks of 16384K size 1024 blocksize
loop: loaded (max 8 devices)
PHY Hard Reset.<3>eth0: using sgDMA mode.
[descriptor_init]Recv V:c900d000, P:07fd0000
[descriptor_init]Send V:c900dc80, P:07fd0c80
probe: PHY found at address 0
probe: PHY found at address 1
XLLTemac_PhyInit: Vitesse 8201 PHY at 1 configured
PHY status register 00007949
eth0: Xilinx EMAC #0 at 0xFFFFFFFF , irq=30
physmap flash device: 2000000 at fc000000
Number of erase regions: 2
Primary Vendor Command Set: 0001 (Intel/Sharp Extended)
Primary Algorithm Table at 010A
Alternative Vendor Command Set: 0000 (None)
No Alternate Algorithm Table
Vcc Minimum: 1.7 V
Vcc Maximum: 2.0 V
Vpp Minimum: 8.5 V
Vpp Maximum: 9.5 V
Typical byte/word write timeout: 256 µs
Maximum byte/word write timeout: 512 µs
Typical full buffer write timeout: 512 µs
Maximum full buffer write timeout: 1024 µs
Typical block erase timeout: 1024 ms
Maximum block erase timeout: 4096 ms
Chip erase not supported
Device size: 0x2000000 bytes (32 MiB)
Flash Device Interface description: 0x0001
- x16-only asynchronous interface
Max. bytes in buffer write: 0x40
Number of Erase Block Regions: 2
Erase Region #0: BlockSize 0x20000 bytes, 255 blocks
Erase Region #1: BlockSize 0x8000 bytes, 4 blocks
cfi_cmdset_0001: Erase suspend on write enabled
Using buffer write method
kmod: failed to exec /sbin/modprobe -s -k RedBoot, errno = 2
RedBoot partition parsing not available
Using physmap partition definition
Creating 4 MTD partitions on "phys_mapped_flash":
0x00000000-0x00040000 : "uboot"
0x00040000-0x01fe0000 : "rootfs"
0x01fe0000-0x01fe8000 : "uboot_env"
0x01fe8000-0x02000000 : "unused"
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 1024 buckets, 8Kbytes
TCP: Hash tables configured (established 8192 bind 16384)
[xenet_open]stats Tx:0 Rx:0 Txerr:0 Rxerr:0 Txd 0, Rxd 0
Sending DHCP requests .eth0: link up; speed 1000Mb; full duplex
PHY control register 00001140; PHY status register 0000796D
eth0: Link carrier restored.
Resetting DCM
[xenet_open]stats Tx:1 Rx:0 Txerr:0 Rxerr:0 Txd 0, Rxd 0
., OK
IP-Config: Got DHCP answer from 10.3.0.33, my address is 10.3.0.34
IP-Config: Complete:
device=eth0, addr=10.3.0.34, mask=255.255.255.252, gw=10.3.0.33,
host=eit4-board0, domain=lab.desres.deshaw.com, nis-domain=(none),
bootserver=10.3.0.33, rootserver=10.3.0.33, rootpath=
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 9779k freed
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
Mounted devfs on /dev
Looking up port of RPC 100003/2 on 10.3.0.33
Looking up port of RPC 100005/1 on 10.3.0.33
Root-NFS: Server returned error -13 while mounting /tftpboot/eit4-board0
VFS: Unable to mount root fs via NFS, trying floppy.
VFS: Cannot open root device "" or 02:00
Please append a correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on 02:00
<0>Rebooting in 180 seconds..
----- typescript of boot session ends here -----
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