New subject: How to make graphical issue go away with 4GB of ram

June 30, 2012

      On Sat, 2012-06-30 at 12:44 -0600, Marc Jones wrote:
...
On Sat, Jun 30, 2012 at 12:01 PM, Kyösti Mälkki <kyosti.malkki@gmail.com> wrote:
...
On Sat, 2012-06-30 at 18:18 +0200, Denis 'GNUtoo' Carikli wrote:
...
Hi,
me and Kyösti Mälkki(kmalkki on IRC) figured out how to workarround the
following problem:
If I installed 4GB of ram in the m4a785t-m the screen comes up,however
it's black.
If I only installed 2GB of ram it worked fine.
I made a patch(I'll send it right after that email) but it seem to break
graphics for the case where 2GB of ram is installed.
So I wonder what would be the correct fix(a fix that would work for
every cases).
Explanation of the patch that will be sent right after the mail:
"basek - mmio_basek;" should be 1048576 (1G):
According to Kyösti Mälkki the correct value for the sizek is 1048576.
So I looked for what could create that size and found that.
I'm not convinced that "basek - mmio_basek" is the right fix but at
least we're in the right direction.
My explanation of the issue: uma_memory_size must reduce the size of the
last RAM resource _below_ 4GB. It now touches the last RAM resource,
even if located over 4GB.
Yes, The UMA graphics memory is allocated in the lower 4GB. I think
that should be happening in mainboard.c. See the AMD reference
platforms.
Do you mean the following:
#if CONFIG_GFXUMA
uint64_t uma_memory_base, uma_memory_size;
#endif

int add_mainboard_resources(struct lb_memory *mem)
{
#if CONFIG_GFXUMA
        lb_add_memory_range(mem, LB_MEM_RESERVED,
                uma_memory_base, uma_memory_size);
#endif
        return 0;
}

With the addition of "select HAVE_MAINBOARD_RESOURCES" in Kconfig ?

if so I already tried that change alone(without other changes) and it
didn't work, I don't remember what it did exactly tough, I can retry if
needed.

Denis.

Re: [coreboot] How to make graphical issue go away with 4GB of ram

Denis 'GNUtoo' Carikli

Kyösti Mälkki

Denis 'GNUtoo' Carikli

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