Re: cmdlineparts and chip initialization order

[Aras Vaichas <arasv@magellan-technology.com>]

Marc Singer wrote:
> With a command line like this:
> 
>   console=ttyAM0 root=/dev/hda1 mtdparts=norflash:2m(boot),-(root);nandflash:32k(apex)ro,-(root)
> 
> I am able to initialization partitions for the NOR flash, but not the
> NAND flash.  It look like the problem is that the NOR flash driver is
> initializing before the mtdparts command line parsed, but the NAND
> flash isn't.
 > <SNIP>
> BTW, it looks like none of the other NAND drivers expect a command
> line partition setup.  Has anyone else tried?

I recently had to do this and had the same problem. I took a look at the low 
level driver code for my particular processor and noted that not all MTD 
drivers had partition parsing code.

e.g  in at91_dataflash.c there is parser related code:

int parse_cmdline_partitions(struct mtd_info *master,
                 struct mtd_partition **pparts, const char *mtd_id);
and ...

#ifdef CONFIG_MTD_CMDLINE_PARTS
         char mtdID[14];
#endif

and ...

#ifdef CONFIG_MTD_CMDLINE_PARTS
         sprintf(mtdID, "dataflash%i", nr_devices-1);
         mtd_parts_nr = parse_cmdline_partitions(device, &mtd_parts, mtdID);
#endif

This parsing code is missing from at91_nand.c, and that's why I wasn't able to 
setup my NAND partitions from the command line (previous posting).


regards,

Aras