Re: notes on riscpc install
On Sat, Apr 06, 2002 at 04:58:24PM +0100, Philip Blundell wrote:
> On Sat, 2002-04-06 at 16:49, Russell King - ARM Linux wrote:
> > Which resolution were you trying? (The parameters from fbset itself for
> > the current resolution will do)
>
> mode "640x480-60"
> # D: 25.175 MHz, H: 31.469 kHz, V: 59.940 Hz
> geometry 640 480 640 3264 4
> timings 39722 48 16 32 11 96 2
> accel true
> rgba 8/0,8/0,8/0,4/0
> endmode
>
> I only have 1MB of VRAM.
That's the problem. 640*480*4 > 1MB of memory.
> Is that going to be a problem, or can the
> driver switch to using DRAM when there isn't enough video memory?
It can't (reliably). You need to grab a 1.2MB contiguous chunk of DRAM
for that mode. Linux does not guarantee allocations of greater than 4K
after the kernel has started booting (due to memory fragmentation).
That said, you can tell it to use DRAM for the framebuffer at boot time
with something like:
video=acorn:dram:1200K
Note that DRAM mode isn't well tested by myself, but I believe it to be
working.
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