Re: command bootu to start kernel

[Juergen Beisert <jbe@pengutronix.de>]

Belisko Marek wrote:
> On Fri, Oct 29, 2010 at 11:26 AM, Marc Kleine-Budde <mkl@pengutronix.de> 
wrote:
> > On 10/29/2010 11:21 AM, Belisko Marek wrote:
> >>>>> do you have a "MEM=32" on your command line?
> >>>>
> >>>> Well I add it but same result:
> >>>
> >>> BTW: It must be "mem=", in lowercase, but you did this.
> >>>
> >>> What I was meant to ask was, if you forget to add the "M" to "32".
> >>> Because with mem=32 you tell Linux just to use 32 bytes of memory.
> >>> Maybe your ATAGs are broken, Linux might not see the whole RAM or any
> >>> if it.
> >>
> >> yes it was typo I forgot put M after 32. Kernel now properly boot :).
> >
> > How much RAM you you have? Adjust mem= accordingly.
>
> Have 64M I will adjust.
>
> >> U-boot somehow
> >> add kernel this parameter? Because for u-boot I don't need to set this
> >> parameter.
> >
> > Nope - u-boot and barebox set up this information in the ATAG list.
> > Seems something is broken with your ATAG list.
>
> Could be a problem thats I load barebox directly to ram and run it and
> then RAM size isn't probed
> and correctly set in atags?

No, you need something like that:

[...]
static struct memory_platform_data ram_pdata = {
	.name		= "ram0",
	.flags		= DEVFS_RDWR,
};

struct device_d mini_sdram_dev = {
	.id		= -1,
	.name		= "mem",
	.map_base	= CS6_BASE,
	.size		= 64 * 1024 * 1024,
	.platform_data	= &ram_pdata,
};

[...]

static int mini2440_devices_init(void)
{
[...]
	register_device(&mini2440_sdram_dev);
[...]
	armlinux_add_dram(&mini2440_sdram_dev);
[...]
}

jbe

-- 
Pengutronix e.K.                              | Juergen Beisert             |
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