large video frame buffer up to 512M for bridge chip connected with HT bus.
It PASS test only in GUP_SP mode, which is the defalut mode in 3A780e branch of PMON.
Address space between 0x40000000 and 0x7fffffff is map to 1G memory space before, now
system momery size is at leaset 2G, so the space is left free to be used as PCI MEM space.
While PCI IO Space and HT Space is the same as before.
NOTICE: pci mem space base address need to be changed to 0x40000000 in kenrel source code
if this patch is applied, otherwise kernel will boot fail. If the bridge chip is connected
to PCIX controler in Loongson CPU, this patch should be changed to be applied.
Target: Bontio3a780e
1. Add Macro RS780E, USE_780E_VGA to indicate using 780e's vga with macro SERVER_3A to identify this board
2. Now framebuffer can only be accessed through pci mem address for tlb not configured properly
3. Device 2 and Device 3 should not be opened, otherwise VGA could not work
1. Porting the 3A+690E x86emu module to 2G+690e platform and it works
correctly.
2. The HT frequency is adjusted to 800MHz.
3. The start address of PCI IO and memory space are adjusted according
to the 3A+690E platform.
4. The framebuffer address(0xb0000000) doesn't map through TLB. The
pcitlb.c is added in start.S, but it doesn't work.
5. Fix the IO-read/write base from 0xa000_0000 to 0x0000_0000 in
sys/linux/io.h.
wanghongmei
xiaqichao
TAI Yunfang
LI Wengang
wanghuandong
qiaochong
root