Hi Sebastien
I am lucky. :) the attach patch fix this bug. I have applied this patch to bios
and rtems.
it works fine with Showwx+ projector and my computer monitor.
If this is ok. I will try to commit that and send patch to rtems also.
Thanks for the links. it's really helpful
Xiangfu
On 02/13/2012 04:28 PM, Sébastien Bourdeauducq wrote:
Hi,
On 02/13/2012 07:26 AM, Xiangfu Liu wrote:
resolution 640x480(rendering mode): Video Not Supported Unknown at 59
resolution 800x600 : Video Not Supported Unknown at 72
resolution 1024x768 : Video Not Supported Unknown at 59
I guess the "at xx" numbers are the vertical refresh frequency.
anyone have idea how to fix this bug?
Try changing the video timing parameters:
https://github.com/milkymist/milkymist/blob/master/software/include/hw/vga.h#L27
Those are written by the RTEMS driver, but you can change them later from the
shell if you find a way to write 32-bit words instead of bytes. Or better, use
the BIOS with the framebuffer enabled and mr/mw which I know work correctly.
There are some explanations about the video signal here:
http://www-mtl.mit.edu/Courses/6.111/labkit/vga.shtml
But without a scope and/or logic analyzer to look at the signals and compare
them with those from a working source, it will be a lot of guessing and
trial/error.
diff --git a/software/libhal/vga.c b/software/libhal/vga.c
index 4aac475..fc11cae 100644
--- a/software/libhal/vga.c
+++ b/software/libhal/vga.c
@@ -276,9 +276,9 @@ void vga_set_mode(int mode)
CSR_VGA_HSYNC_END = 752;
CSR_VGA_HSCAN = 799;
CSR_VGA_VRES = 480;
- CSR_VGA_VSYNC_START = 491;
- CSR_VGA_VSYNC_END = 493;
- CSR_VGA_VSCAN = 523;
+ CSR_VGA_VSYNC_START = 492;
+ CSR_VGA_VSYNC_END = 494;
+ CSR_VGA_VSCAN = 524;
CSR_VGA_CLKSEL = 0;
break;
case VGA_MODE_800_600: // Pixel clock: 50MHz
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