Now support GFXUMA and GFXSP mode includes: SP mode (2G,4G)X(64M,128M),UMA mode
(2G,4G)X(64M,128M,256M,512M). Notice that: In UMA mode, change physical memory
address starting from 0x80000000 in order to satisfy 32-bit pci config address
access to internal gfx device. So This bios can go ok only with the suitable
kernel image in which pysical memory address also begins with 0x80000000. In UMA
mode, if glxgears is running, sometimes black screen will appear, this may be due
to it uses too much system bandwidth. While in SP mode, this problem never occures.
Now video frame buffer size can be assigned in configuration file:Bonito.3a780e,
Changing "VRAM_SIZE=128" means set video memory size to be 128M in UMA or SP mode.
No other code need to be changed. Notice: in GFX_SP mode, max video ram size is 128M
becasue of the graphic memory capacity limit in LS3A780E board at this moment.
Submmited and tested by xiaqichao@ict.ac.cn
Target:Bonito3a780e
wanghongmei
a41a766ad7