[U-Boot] u-boot: How to read file from FAT filesystem on NorFlash MTD partition

[Xianwei Zeng]

Dear Wolfgang Denk,

Sorry for the simple question, but I can't find the document to guide me
to read file from FAT file system in NOR FLASH.

On Mon, Nov 16, 2009 at 3:40 PM, Wolfgang Denk <wd at denx.de> wrote:

> Dear Xianwei Zeng,
>
> In message <52c6d4120911151729s61a250e0j1b0ec02b43191036 at mail.gmail.com>
> you wrote:
> >
> > Yes. I didn't enable the mtdparts support. I will try it.
> >
> > Do I need to write extra driver, for example something I was doing,
> > writing FAT + MTD support?
>
> No, you don't need any special drivers.
>
>
After I enbale CONFIG_CMD_MTDPARTS, I can get MTD partition information.
For example, I set env to:

  mtdids=nor0=smt300-nor
  mtdparts=mtdparts=smt300-nor:4608k at 0x00080000(sys)ro

And then I can use mtdparts command to list the partition info:

device nor0 <smt300-nor>, # parts = 1
 #: name                size            offset          mask_flags
 0: sys                 0x00480000      0x00080000      1

But I still don't know the way how to read file inside this FAT filesystem.

  * Which command can do this? (fatload seems can not because the interface
is not known)
  * From which verion u-boot supports this feature? Our u-boot is based
v2009.08. Do we
    need to update to latest one? (v2009.11-rc1)

Any document you suggest me to read? u-boot/README is not enough.

Thank you very much.

-- 
Best Regards
Xianwei ZENG
----Linux Fans