On Mon, Oct 17, 2011 at 4:40 AM, Oskar Enoksson enok@lysator.liu.se wrote:
On 10/17/2011 04:24 AM, Marc Jones wrote:
On Sun, Oct 16, 2011 at 4:57 AM, Oskar Enokssonenok@lysator.liu.se wrote:
Can someone explain what RAMINIT_SYSINFO configuration option does? I thought I understood, but I don't.
/Oskar
Hi Oskar,
RAMINIT_SYSINFO is the config option to create the AMD sysinfo structure in CAR above the stack. This is a way to get global data in the romstage (heap like without any management). The space for the data structure is allocated by the DCACHE_RAM_GLOBAL_VAR_SIZE config and the pointer is setup in cache_as_ram_main.
So setting RAMINIT_SYSINFO enables some functionality that needs that data in the romstage, e.g. optimize_link_incoherent_ht (?) But what would be the reason to NOT use RAMINIT_SYSINFO? To save space in the cache?
Yes, and if you had a platform that didn't require it for memory training or other features that use the sysinfo structure. For K8, I recommend that you leave it enabled.
Marc