linux 2.6 boot failure with rfs installed in the flash disk (xupv2p + ppc)

[saadia dhouib]

Hi all,

After booting successfully the kernel with the ramdisk, I tried to boot the
kernel with a root file system installed on the third partition of the flash
disk. 
Partition 1: Type = FAT16, Size = 32Mbyte
Partition 2 : Type = Linux Swap, Size = 256Mbyte
partition 3: Type=Linux, Size = 950 Mbyte

I installed the filesystem (using BusyBox 1.12.1, and the script mkrootfs.sh
written by Wofgang Klingauf), and I configured the kernel to support xsysace
driver.

I changed bootargs to "console=ttyUL0,9600 root=/dev/xsa3 rw"; /* it was
console=ttyS0, root=/dev/ram rw*/

I rebooted the kernel, it stops after "Warning: unable to open an initial
console."

The output of the console is as follows:

*****************************************************************************************
zImage starting: loaded at 0x00400000 (sp: 0x0059eefc)
Allocating 0x377124 bytes for kernel ...
gunzipping (0x00000000 <- 0x0040c000:0x0059d133)...done 0x3545e8 bytes

Linux/PowerPC load: console=ttyUL0,9600 root=/dev/xsa3 rw
Finalizing device tree... flat tree at 0x40ae18
Using Xilinx Virtex machine description
Linux version 2.6.27-rc9 (dhouib at lo-lester-030) (gcc version 3.4.5) #29
PREEMPT Mon Nov 3 16:23:09 CET 2008
Zone PFN ranges:
  DMA      0x00000000 -> 0x00010000
  Normal   0x00010000 -> 0x00010000
Movable zone start PFN for each node
early_node_map[1] active PFN ranges
    0: 0x00000000 -> 0x00010000
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 65024
Kernel command line: console=ttyUL0,9600 root=/dev/xsa3 rw
Xilinx intc at 0x41200000 mapped to 0xfdfff000
PID hash table entries: 1024 (order: 10, 4096 bytes)
clocksource: timebase mult[d55555] shift[22] registered
Console: colour dummy device 80x25
console [ttyUL0] enabled
Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)
Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)
Memory: 256000k/262144k available (3256k kernel code, 5832k reserved, 128k
data, 136k bss, 160k init)
Calibrating delay loop... 598.01 BogoMIPS (lpj=1196032)
Mount-cache hash table entries: 512
net_namespace: 756 bytes
NET: Registered protocol family 16
PCI: Probing PCI hardware
NET: Registered protocol family 2
IP route cache hash table entries: 2048 (order: 1, 8192 bytes)
TCP established hash table entries: 8192 (order: 4, 65536 bytes)
TCP bind hash table entries: 8192 (order: 3, 32768 bytes)
TCP: Hash tables configured (established 8192 bind 8192)
TCP reno registered
NET: Registered protocol family 1
Installing knfsd (copyright (C) 1996 okir at monad.swb.de).
msgmni has been set to 500
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered (default)
Serial: 8250/16550 driver4 ports, IRQ sharing disabled
40600000.serial: ttyUL0 at MMIO 0x40600003 (irq = 16) is a uartlite
brd: module loaded
loop: module loaded
xsysace 41800000.sysace: Xilinx SystemACE revision 1.0.12
xsysace 41800000.sysace: capacity: 3940272 sectors
 xsa: xsa1 xsa2 xsa3
Xilinx SystemACE device driver, major=254
mice: PS/2 mouse device common for all mice
i2c /dev entries driver
TCP cubic registered
NET: Registered protocol family 17
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
EXT2-fs warning: mounting unchecked fs, running e2fsck is recommended
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 160k init
Warning: unable to open an initial console.
 

*******************************************************************

I made a search in the net and I have found in (
http://rm-rfroot.net/files/courses/xupv2p/docs/carithers/report.pdf) that:
If we do not include the option to automatically mount the ‘/dev’ file
system, the init process will not be able to open a terminal since ‘console’
is listed in ‘/dev’ as a device. 

But there was no option in the kernel config that enable /dev Automatically
mount at boot.

 

My questions are:

1. can i configure the kernel to automatically mount /dev at boot?

2. how can I configure correctly the ram size (the default options
virtex4_defconfig are: CONFIG_BLK_DEV_RAM_COUNT=16
CONFIG_BLK_DEV_RAM_SIZE=8192). But I have an SDRAM of 256 Megabytes size.

 

Thanks 

Saadia

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