On 14/5/22 08:43, Pali Rohár wrote:
> On Wednesday 02 March 2022 15:44:05 Ash Logan wrote:
>> pgtable_32.c:mapin_ram loops over each valid memory range, which means
>> non-contiguous memory just works.
>
> Hello! Does it mean that non-contiguous memory works for any 32-bit
> powerpc platform, and not only for wiiu? If yes, should not be
> non-contiguous memory support enabled for all 32-bit ppc boards then?
Hi! Sorry for my delayed response. As best I can tell, it does indeed
Just Work, but I have only been able to test on wiiu which is missing a
lot of features other boards have (like PCI) - so it's possible there's
still an assumption elsewhere in the kernel that I haven't hit.
As best I can tell, the Wii and Wii U are the only 32-bit powerpc boards
out there where it's even possible to have non-contiguous memory.
>> Signed-off-by: Ash Logan <a...@heyquark.com>
>> ---
>> arch/powerpc/mm/init_32.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
>> index 3d690be48e84..59a84629d9a0 100644
>> --- a/arch/powerpc/mm/init_32.c
>> +++ b/arch/powerpc/mm/init_32.c
>> @@ -125,10 +125,10 @@ void __init MMU_init(void)
>> * lowmem_end_addr is initialized below.
>> */
>> if (memblock.memory.cnt > 1) {
>> -#ifndef CONFIG_WII
>> +#if !defined(CONFIG_WII) && !defined(CONFIG_WIIU)
>> memblock_enforce_memory_limit(memblock.memory.regions[0].size);
>> pr_warn("Only using first contiguous memory region\n");
>> -#else
>> +#elif defined(CONFIG_WII)
>> wii_memory_fixups();
>> #endif
>> }
>> --
>> 2.35.1
>>
