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List:       uclinux-dev
Subject:    Re: [uClinux-dev] ROMFS troubles
From:       rwarner <rwarner () kuttatech ! com>
Date:       2008-06-26 17:48:34
Message-ID: 4863D672.1000503 () kuttatech ! com
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Greg Ungerer wrote:
> Hi Steven,
> 
> steven taffs wrote:
>> still cant get to ROMFS loaded, I downloaded a uClinux-dist-2005 and 
>> copyed my linux-2.6.x directory into it and now I can compile jffs2 
>> but that still doesnt help me load the ROMFS
>>  
>> I am currently loading the romfs image from flash @ 0x180000 into ram 
>> at 0x1001c26c (_ebss) using the cp.b uboot command and then executing 
>> the kernel with go 0x80000.
>> uclinux.c seems to be working however I get
>  >
>> Kernel panic - not syncing: No init found.  Try passing init= option 
>> to kernel
> 
> Booting to this point suggests that your are past mounting
> the ROMfs.
> 
> Do you have a valid "/sbin/init", "/etc/init", "/bin/init" or
> "/bin/sh" in your ROMfs for the kernel to run?
> 
> 
>> if I dont copy ROMFS from flash to ram before executing the kernel
>>  
>> VFS fails to mount a file system, so the kernel must be seeing 
>> something has anyone get any ideas ? the full kernel output follows
>>  
>> RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
>> loop: loaded (max 8 devices)
>> uclinux[mtd]: RAM probe address=0x1001c26c size=0x100000
>> Creating 1 MTD partitions on "RAM":
>> 0x00000000-0x00100000 : "ROMfs"
>> mtd: Giving out device 0 to ROMfs
>> uclinux[mtd]: set ROMfs to be root filesystem
>> *****
>> VFS: test  name = </dev/root>
>> VFS: fs_name = <romfs>
>> mtdblock_open
>> ok
>> mtdblock: read on "ROMfs" at 0x0, size 0x200
>> mtdblock: read on "ROMfs" at 0x200, size 0x200
>> VFS: Mounted root (romfs filesystem) readonly.
>> VFS: tried fs_name = <romfs> err 0
>> Freeing init memory: 4K
>> mtdblock: read on "ROMfs" at 0x3000, size 0x200
>> mtdblock: read on "ROMfs" at 0x3200, size 0x200
>> Warning: unable to open an initial console.
> 
> Have you created device nodes in your ROMfs?
> 
> 
>> mtdblock: read on "ROMfs" at 0xc00, size 0x200
>> mtdblock: read on "ROMfs" at 0xe00, size 0x200
>> Kernel panic - not syncing: No init found.  Try passing init= option 
>> to kernel.
> 

Having just gone through this.  You be missing the the poriotn of the 
Vendor Make file.  Example on the AT91 is:
DEVICES = \
	tty,c,5,0      console,c,5,1      cua0,c,5,64      cua1,c,5,65  \
	\
	mem,c,1,1      kmem,c,1,2         null,c,1,3       ram0,b,1,0 \
	ram1,b,1,1 \
	\
<snip>
	ttypc,c,3,12   ttypd,c,3,13       ttype,c,3,14     ttypf,c,3,15 \
	\
	mtd0,c,90,0        mtd1,c,90,2        mtd2,c,90,4 \
	\
	mtdblock0,b,31,0   mtdblock1,b,31,2  mtdblock2,b,31,4 \
	\
	zero,c,1,5     random,c,1,8       urandom,c,1,9

hths - bob
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