[U-Boot] Searching for JFFS2 understanding.

[Charles Krinke]

A litrtle bit more info. I turned on the debug statements in u-boot and when
I do an ls of the jffs2 file system, I see this:

*=> ls

---mtdparts_init---
dev id: type = 1, num = 0, size = 0x01000000, mtd_id = single part
part  : name = static, size = 0x01000000, offset = 0x00000000

--- jffs2_part_info: partition number 0 for device nor0 (single part)
Scanning JFFS2 FS: ...... done.
 drwxrwxr-x        0 Sun Apr 03 17:39:05 2011 bin
 drwxr-xr-x        0 Sat Apr 02 19:03:52 2011 dev
 drwxr-xr-x        0 Sun Apr 03 17:39:05 2011 etc
 drwxrwxr-x        0 Sat Apr 02 19:03:52 2011 home
 lrwxrwxrwx        9 Sun Apr 03 17:39:05 2011 init -> sbin/init
 ...
 drwxrwxrwt        0 Sat Apr 02 19:03:39 2011 tmp
 -rw-r--r--  1892470 Sun Apr 03 17:37:56 2011 uImage
 drwxrwxr-x        0 Tue Nov 30 15:52:43 2010 usr
 drwxrwxr-x        0 Tue Nov 30 15:52:43 2010 var
*
On Sun, Apr 3, 2011 at 11:36 AM, Charles Krinke <charles.krinke at gmail.com>wrote:

> I believe the command line to the kernel is indeed not quite complete, but
> here it is at this point:
>
> *bootargs root=mtd:nor0 rw rootfstype=jffs2
> mtdparts=nor0:3072k(u-boot),-(jffs2) console=ttyS0,115200*
>
> With this command line, the kernel printk's just before it panics are:
> *MTDSB: dev_name "mtd:nor0"
> MTDSB: mtd:%s, name "nor0"
> MTD: MTD device with name "nor0" not found.
> MTDSB: lookup_bdev() returned -2
> VFS: Cannot open root device "mtd:nor0" or unknown-block(0,0)
> *
> I can see by looking in the mtdsuper.c file in the kernel that it is now
> looking for mtd:something and that the previous /dev/mtdblockX is
> deprecated.
>
> I believe I am close but dont quite have the new syntax for passing this
> command line for jffs2.
>
>
>
>
> On Sun, Apr 3, 2011 at 1:20 AM, Wolfgang Denk <wd at denx.de> wrote:
>
>> Dear Charles Krinke,
>>
>> In message <AANLkTi=pfBvvVko1iRnuxdyyU0xWdK6pGretf90+jO5F at mail.gmail.com>
>> you wrote:
>> >
>> > I have *CONFIG_CMD_JFFS2* defined, but not *CONFIG_CMD_MTDPARTS* as they
>> > seem to be mutually exclusive.
>>
>> They are not.  There are 64 boards in mainline which define both.
>>
>> > thinking this would define sufficiently mtdparts for the Linux kernel to
>> > boot. Maybe there is a C source file in the linux kernel that needs the
>> mtd
>> > partitioning information hard-code? I vaguely remember something like
>> this a
>> > while back.
>>
>> No.  You just select CONFIG_MTD_CMDLINE_PARTS=y in the Linux kernel
>> configuration.
>>
>> > List of all partitions:
>> > No filesystem could mount root, tried:  jffs2*
>>
>> Seems your kernel does not recognize any MTD partitions at all.
>>
>> Do you pass any mtdparts= boot argument to the kernel at all?
>> What exactly are your bootargs?
>>
>> Did you enable MTD support and CMDLINE_PARTS in the kernel config?
>>
>> Best regards,
>>
>> Wolfgang Denk
>>
>> --
>> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
>> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
>> Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
>> Die Freiheit des Menschen liegt nicht darin, dass er tun kann, was er
>> will, sondern darin, dass er nicht tun muss, was er nicht will.
>>                                             -- Jean-Jacques Rousseau
>>
>
>
>
> --
> Charles Krinke
>
>
>


-- 
Charles Krinke