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Message
From: rich_daddio at yahoo.com<rich_daddio@y...>
Date: Tue Feb 26 17:39:26 CET 2008
Subject: [openrisc] problem of romfs in or32 uclinux kernel
Hi Charlie,
Not sure if this will help but does your console point to tty? With the
ramdisk we do this in /dev:
ln -s ttyS0 console
If you want to see the ramdisk stuff required to boot and get a console:
www.meansoffreedom.com/Ramdisk_Howto.html
HTH & Best Regards,
Rich d
----- Original Message -----
From: charlie yang<ydt@u...>
To:
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
>
>
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