[U-Boot] Enabling ARM DCache (and MMU setup) in U-Boot

[Lv Terry-R65388]

 Hi Rasha,

	As I know, u-boot has a weak support on mmu and cache.

	We have enabled mmu and dcache in our u-boot version.
	But I don't know what your case is.

	So I can just give you some suggestions.

	1. mmu and dcache should be enabled very early, for example, in start.S or lowlevel_init.S.
	2. Although functions in cache-cp15.c are inlined, they will be compiled as functions if you use them.
	   So you may need to modify cache-cp15.c to cache-cp15.h and modify inline functions to macros.
	3. Add flush_cache functions. This function is needed in funcion cleanup_before_linux() in cpu.c.

	Thanks~~

Yours
Terry

> -----Original Message-----
> From: u-boot-bounces at lists.denx.de 
> [mailto:u-boot-bounces at lists.denx.de] On Behalf Of Rasha Eqbal
> Sent: 2010年7月1日 23:35
> To: u-boot at lists.denx.de
> Subject: Re: [U-Boot] Enabling ARM DCache (and MMU setup) in U-Boot
> 
> Hi,
> 
> I am having exactly the same problem as described here by 
> Drasko. Once I enable MMU on ARM920T by setting the cp15 
> register 1, I get a data abort.
> Since the previous messages were posted a long time back, I 
> was hoping someone has been able to find a solution to the 
> problem. I am trying to setup MMU.
> 
> Any help would be greatly appreciated.
> 
> Thanks a lot in advance.
> Rasha
>