[PATCH 4/4] Geode GX2 auto DRAM detect patch V2

[Nils]

This patch changes Geode GX2 to use the auto DRAM detect code
from Geode LX and changes the boards to use it.
It also  adds a processor speed setting function in human 
readable Mhz and removes the useless and broken PLLMSR settings.
(the processor speed was hardcoded to 366Mhz in pll_reset.c)

Signed-off-by: Nils Jacobs <[e-mail]>

Thanks, Nils.

[Uwe Hermann]

On Sun, Oct 31, 2010 at 10:58:28PM +0100, Nils wrote:
> This patch changes Geode GX2 to use the auto DRAM detect code
> from Geode LX and changes the boards to use it.
> It also  adds a processor speed setting function in human 
> readable Mhz and removes the useless and broken PLLMSR settings.
> (the processor speed was hardcoded to 366Mhz in pll_reset.c)
>
> Signed-off-by: Nils Jacobs <[e-mail]>

Thanks, r6011 with some small whitespace changes and s/Mhz/MHz/.
> Index: src/northbridge/amd/gx2/Kconfig
> ===================================================================
> --- src/northbridge/amd/gx2/Kconfig	(revision 6006)
> +++ src/northbridge/amd/gx2/Kconfig	(working copy)
> @@ -21,3 +21,9 @@
>   bool
>   select GEODE_VSA
>
> +# Valid PROCESSOR_MHZ options: 300 ; 366 ; 400 Mhz
> +config PROCESSOR_MHZ
> +	int
> +	default 366
> +	depends on NORTHBRIDGE_AMD_GX2

Maybe we could make a GX2_PROCESSOR_MHZ_300, GX2_PROCESSOR_MHZ_366 etc.
here, and let each board "select" the correct one in its Kconfig file?
> +static void banner(const char *s)
> +{
> +	printk(BIOS_DEBUG, " * %s\n", s);
> +}

I'd personally drop this (also in the LX code), let's just use printk(),
there's no reason to add such a mini-wrapper.
> +	if (CONFIG_PROCESSOR_MHZ == 400){
> +		DEFAULT_FBDIV = 24;
> +	}
> +	else if (CONFIG_PROCESSOR_MHZ == 366){
> +		DEFAULT_FBDIV = 22;
> +	}
> +	else if (CONFIG_PROCESSOR_MHZ == 300){
> +		DEFAULT_FBDIV = 18;
> +	} else {
> +		printk(BIOS_ERR, "Unsupported PROCESSOR_MHZ setting !\n");
> +		post_code(POST_PLL_CPU_VER_FAIL);
> +		__asm__ __volatile__("hlt\n");

Shouldn't there be a "while (1)" around the hlt instruction?


Uwe.
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