Re: More than 512MB of memory

[Rojhalat Ibrahim <ibrahim@schenk.isar.de>]

Ralf Baechle wrote:
> On Tue, Jan 18, 2005 at 03:44:51PM +0100, Rojhalat Ibrahim wrote:
>
>
> > is there anything special I have to do
> > when I want to use more than 512MB of memory?
> > My Yosemite board works fine with 512MB
> > but when I try 1GB it crashes in 32bit mode
> > with highmem and also in 64bit mode.
> > The boot monitor (PMON) maps the 1024MB
> > to physical addresses 0x0000.0000 - 0x4000.0000.
>
> Can you try below patch?
>
>   Ralf
>
> --- linux/arch/mips/mm/c-r4k.c  2004-12-07 02:30:50.000000000 +0000
> +++ linux/arch/mips/mm/c-r4k.c  2005-02-04 00:31:34.623814760 +0000
> @@ -566,7 +566,10 @@
>  
>  	if (!cpu_has_ic_fills_f_dc) {
>                 unsigned long addr = (unsigned long) page_address(page);
> -               r4k_blast_dcache_page(addr);
> +               if (addr)
> +                       r4k_blast_dcache_page(addr);
> +               else
> +                       r4k_blast_dcache();
>                 if (!cpu_icache_snoops_remote_store)
>                         r4k_blast_scache_page(addr);
>                 ClearPageDcacheDirty(page);

With a slightly extended patch it actually works. But afterwards
I get a lot of Illegal instructions and Segmentation faults, where
there shouldn't be any. Below is the patch I used.

Thanks
Rojhalat Ibrahim


--- linux/arch/mips/mm/c-r4k.c  2005-01-03 10:23:27.000000000 +0100
+++ linux-2.6.10/arch/mips/mm/c-r4k.c   2005-02-07 09:04:27.000000000 +0100
@@ -566,9 +566,17 @@

        if (!cpu_has_ic_fills_f_dc) {
                unsigned long addr = (unsigned long) page_address(page);
-               r4k_blast_dcache_page(addr);
+               if (addr)
+                       r4k_blast_dcache_page(addr);
+               else
+                       r4k_blast_dcache();
                if (!cpu_icache_snoops_remote_store)
-                       r4k_blast_scache_page(addr);
+               {
+                       if (addr)
+                               r4k_blast_scache_page(addr);
+                       else
+                               r4k_blast_scache();
+               }
                ClearPageDcacheDirty(page);
        }