The E6400 uses a 100 MHz reference clock on DPLL_REF_SSCLK, whereas
libgfxinit assumed that the reference was always 96 MHz. The frequency
difference caused by a 100 MHz reference with PLL config values
calculated assuming a 96 MHz reference were not significant enough to
cause noticable issues with the more common 1280 x 800 panels, but are
enough to matter for the 1440 x 900 panels which use a higher pixel
clock. This only affected the pre-OS graphics environment provided by
libgfxinit, as Linux drivers would determine the reference clock
frequency based on data in the VBT.
Fix this by making the reference clock frequency in libgfxinit
configurable for GM45 based on a new coreboot Kconfig, which is set to
100 MHz for the E6400.
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
re-use the same patches, and drop the same patches.
this tree uses hell's special ddr2 fix, which we apply
for the dell latitude e6400.
Signed-off-by: Leah Rowe <leah@libreboot.org>
the e6400_4mb target has libgfxinit and (if seabios) vgarom
initialisation, but has issues on the nvidia model, even when
using nomodeset. with this target, e6400nvidia_4mb, only
the vgarom initialisation is used, libgfxinit is disabled.
on nvidia models, this one should work a little bit better.
specifically: nouveau crashes on this machine, with libreboot
installed, but you can use nomodeset. however, when libgfxinit
is also enabled, nomodeset no longer works properly.
so this target disables all video initialisation in coreboot.
only seabios will initialise anything video-related, by
executing the vga option rom.
Signed-off-by: Leah Rowe <leah@libreboot.org>
Nicholas Chin
Leah Rowe