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From: charlie yang<ydt@u...>
Date: Mon Feb 25 10:56:04 CET 2008
Subject: [openrisc] problem of romfs in or32 uclinux kernel
Hi all,
I downloaded orp_soc as the cpu sample and tested the cpu on the
altera FPGA board. The flash ,SDRAM and UART controller cores has
been verfied ok and the basic programs like "hello uart" has run
successfully.

So I try to build uclinux kernel with rom file system, genromfs
following the readme and at uclinux/uClinux-2.0.x/README.or32. When I
run linux in or32-simulator under cygwin enviroment, the kernel start
information is:

/**************************************************/
OpenRisc 1000 support (C) www.opencores.org
uClinux/OR32
Flat model support (C) 1998,1999 Kenneth Albanowski, D. Jeff Dionne
KERNEL -> TEXT=0x4000c20-0x404df62 DATA=0x002000-0x007714
BSS=0x007720-0x02257d
KERNEL -> ROMFS=0x02257d-0x022580 MEM=0x022580-0x3ff000
STACK=0x3ff000-0x400000
Command line: 'CONSOLE=/dev/ttyS0'
BLK_DEV_INITRD addr: 0x404df70-0x40ae370
start_mem is 0x22580
virtual_end is 0x3ff000
free_area_init -> start_mem is 0x25580
virtual_end is 0x3ff000
Mem_init: start=33000, end=3ff000
Memory available: 3888k/4084k RAM, 3785k/4096k ROM (204k kernel
data, 311k code)
Swansea University Computer Society NET3.035 for Linux 2.0
NET3: Unix domain sockets 0.13 for Linux NET3.035.
uClinux version 2.0.38.1pre3 (charlie at charlie-desktop) (gcc version
3.4.4) #1 Mon Feb 25 16:43:36 2008
Serial driver version 4.13p1 with no serial options enabled
ttyS00 at 0x90000000 (irq = 2) is a 16550A
Ramdisk driver initialized : 16 ramdisks of 2048K size
Blkmem copyright 1998,1999 D. Jeff Dionne
Blkmem copyright 1998 Kenneth Albanowski
Blkmem 0 disk images:
RAMDISK: Romfs filesystem found at block 0
RAMDISK: Loading 385 blocks into ram disk... bdflush()
activated...sleeping again.
bdflush() activated...sleeping again.
bdflush() activated...sleeping again.
bdflush() activated...sleeping again.
done.
VFS: Mounted root (romfs filesystem) readonly.
Warning: dev (04:40) tty->count(1) != #fd's(0) in tty_open
/***************************************************/

But there is a warning and kernel can't run the sash program in the
romfs.

When I downloaded the linux bin file into FPGA, the warning
disappeared. But I still can't enter the sash shell and input characters
in serial terminal. What's the matter here? Does anybody test the romfs
in uclinux ? Please give me some hints, thanks .


Best regards
Charlie