Re: Fw: rootfs as JFFS2 on AT91SAM9260

["Michel Benoit" <murpme@xxxxxxxxx>]

You can define the nand partitions in
arch/arm/mach/mach-at91rm9200/board-at91sam9260ek.c.

Here is an example:


/*
* NAND flash
*/
static struct mtd_partition __initdata ek_nand_partition[] = {
	{
		.name	= "boot",
		.offset	= 0,
		.size	= 0x00080000,
               .mask_flags = MTD_WRITEABLE, /* force read-only */
	},
       {
               .name	= "kernel0",
		.offset	= 0x00080000,
		.size	= 0x00300000,
//                .mask_flags = MTD_WRITEABLE, /* force read-only */
	},
       {
               .name	= "kernel1",
		.offset	= 0x00380000,
		.size	= 0x00300000,
//                .mask_flags = MTD_WRITEABLE, /* force read-only */
	},

	{
		.name	= "rfs0",
		.offset	= 0x00680000,
		.size	= 0x00A00000,
//                .mask_flags = MTD_WRITEABLE, /* force read-only */
	},
	{
		.name	= "rfs1",
		.offset	= 0x01080000,
		.size	= 0x00A00000,
//                .mask_flags = MTD_WRITEABLE, /* force read-only */
	},

       {
		.name	= "user",
		.offset	= 0x01A80000,
		.size	= 0x0E580000,
	},


};

static struct mtd_partition *nand_partitions(int size, int *num_partitions)
{
	*num_partitions = ARRAY_SIZE(ek_nand_partition);
	return ek_nand_partition;
}

static struct at91_nand_data __initdata ek_nand_data = {
	.ale		= 21,
	.cle		= 22,
//	.det_pin	= ... not connected
	.rdy_pin	= AT91_PIN_PC13,
	.enable_pin	= AT91_PIN_PC14,
	.partition_info	= nand_partitions,
#if defined(CONFIG_MTD_NAND_AT91_BUSWIDTH_16)
	.bus_width_16	= 1,
#else
	.bus_width_16	= 0,
#endif
};


On 4/5/07, Nicolas Brouard <nicolas.brouard@xxxxxxxxxxx> wrote:
> Ulf Samuelsson <ulf <at> atmel.com> writes:
>
> >
> > I have never set those parameters, when I created the JFFS2 system.
> > Maybe you shouldn't do that either...    I.E set PHYSMAP to no.
> >
> > Create a directory structure containing your root file systems
> > and then run mkfs.jffs2 on that according to Michels advice.
> >
> > I automate this by using Buildroot...
> >
> > Best Regards
> > Ulf Samuelsson                ulf <at> atmel.com
>
> OK, but how can I do the mapping between mtd devices (/dev/mtdx and
> /dev/mtdblocx) and the physical address of the flash?
> I don't know how to set the size and the start address of each partitions?
>
> Nicolas
>
>
>
>
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