[microblaze-uclinux] uClinux boots on MicroBlaze but......

[anand_12 <anand_12@xxxxxxxxxxxx>]

Hi all,

We are trying to get uClinux(latest dist) running on the 
insight memec spartan 2e 600 LC development board.After some initial hiccups,somehow got the kernel booting(starting address : 0x80000000)..but it hung after printing "calibrating delay loop..." on the hyperterm...i mean there was no activity beyond that..even after a wait of abt 10 minutes...so next time we commented out the Bogomips computation loop(in linux/init/main.c,..and as expected we got the kernel booting further(why is that delay there and is using such a workaround advisable?)...the kernel boot log(as seen on hyperterm) is as shown below : 

-----------------------START------------------------------- 

Linux version 2.4.24-uc0 (root@soc3) (gcc version 2.95.3-4 Xilinx EDK 6.1 Build 
EDK_G.11) #54 Thu Jun 24 14:26:12 IST 2004 
On node 0 totalpages: 8192 
zone(0): 8192 pages. 
zone(1): 0 pages. 
zone(2): 0 pages. 
CPU: MICROBLAZE 
Console: xmbserial on UARTLite 
Kernel command line: 
Calibrating delay loop...
Memory: 31472K/32768K available (594K kernel code, 210K data) 
Dentry cache hash table entries: 4096 (order: 3, 32768 bytes) 
Inode cache hash table entries: 2048 (order: 2, 16384 bytes) 
Mount cache hash table entries: 512 (order: 0, 4096 bytes) 
Buffer cache hash table entries: 1024 (order: 0, 4096 bytes) 
Page-cache hash table entries: 8192 (order: 3, 32768 bytes) 
POSIX conformance testing by UNIFIX 
Linux NET4.0 for Linux 2.4 
Based upon Swansea University Computer Society NET3.039 
Microblaze UARTlite serial driver version 1.00 
ttyS0 at 0xffff2000 (irq = 1) is a Microblaze UARTlite 
ttyS1 at 0xffff4000 (irq = 2) is a Microblaze UARTlite 
Starting kswapd 
pty: 256 Unix98 ptys configured 
xgpio #0 at 0xFFFF5000 mapped to 0xFFFF5000 
Xilinx GPIO registered 
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize 
VFS: Cannot open root device "" or 00:00 
Please append a correct "root=" boot option 
Kernel panic: VFS: Unable to mount root fs on 00:00 

--------------------------END------------------------------ 

but as is clear from the above bootlog....root filesystem could not be mounted....we are trying to figure out how and why this kernel panic'd here and what to do to proceed further.... can any one help us out as to whats going on here?...at the end of the uClinux build process...6 files are created in the uClinux-dist/images directory..one of them being romfs.img....why is this generated and what is it used for?...is this file related to the kernel panic message in the kernel bootlog shown above?..

besides 2 serial ports seem to have been detected(there is only one on the board!! )..or does that mean something else(ttyS0 and ttyS1? ..please guide us here....

i just checked the hardware address mapping oxffff2000 maps to UART but 0xffff4000 maps to OPB timer... 

one more thing that we noticed is that somehow the value 9 is being driven to the 7 segment display on the board
during the booting process(address mapping of GPIO leds : 0xffff3000-...)
why is this happening?..is it an indication of something important?...

thanks a bunch in advance for any clarification in this regard...

Regards 

V.Anand 
(www.tenet.res.in)





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