[U-Boot-Users] CONFIG_MMC: mapping the device to physical memoryfor sharp ZAURUS

[my lists]

Thanks ... I'll ne having a look at that tonignt.
So if I keep using access to MMC only via fs all I need is
define CONFIG_MMC 1
in my include/configs/corgi.h ?

What would I then need to use in the 
CONFIG_BOOTCOMMAND
to boot from a kernel in MMC filesystem ?
Currently I'm loading kernel from flash with specific nand logical reads
(common/cmd_nand.c has been patched with extra code for the nand read.logical
functionality)
nand read.logical 0xa0800000 0x005a0000 0x00160000

and then booting from memory 
bootm             



I was also wondering if I can get ext2 filesystem support for MMC ... I like to
format my mmc for Zaurus as ext2/3 when I keep system stuff on there.
My goal would be to have kernel loaded from an ext2/3 formatted MMC .... so
that I could have a totally different system booting from MMC ... and keep a
working and stable complete system (including different kernel) on the onboard
flash totally untouched.


Regards
David

--- Joey Oravec <joravec at drewtech.com> wrote:

> "my lists" <lists_my at yahoo.com> wrote in message 
> news:187928.85495.qm at web57312.mail.re1.yahoo.com...
> > CFG_MMC_BASE: is this the base address where MMC is mapped ?
> >
> > include/configs/pxa255_idp.h:#define CFG_MMC_BASE               0xF0000000
> > is this usable gererically for pxa255 or only for that specific board ?
> > if not how can I find out where it is mapped (if there is no tech 
> > documentation
> > avalible for sharp Zaurus) ?
> 
> Take a look at cpu/pxa/mmc.c. This adds a few functions like 
> mmc_block_read(), mmc_block_write(), and mmc_init() which interact with the 
> media card. Typically init will register the card as a FAT filesystem, and 
> you'll let those functions interact with the card.
> 
> In my version of the code, CFG_MMC_BASE mainly affects the "cp" command in 
> common/cmd_mem.c. Some functions like that will let you interact with the 
> card as a raw device, as if it were mapped into unused memory. They'll call 
> mmc2info() to decide if the address is within that assigned range. I don't 
> find this feature very useful and always interact with the card as a 
> filesystem.
> 
> -joey 
> 
> 
> 
> 
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