Posted on May 18, 2004 at 18:05 Hi,
I am using an STPC Atlas demo board with the primary bootloader (Nov 2003). Board is BA000103EE.
The new bootloader does not appear to enable VGA output on my board. The old bootloader however, did.
I notice there is a slight change between the old and new bootloader, wheres to enable onchip VGA with the new bootloader, you just set the framebuffer size > 0.
With the old one it was necessary to set a bit in the protected mode flag:
10h dword Bit 0: '1' to launch the secondary loader in protected mode
Bit 8: '1' to initialize a VGA mode (text 80*25 16 colors)
All other bits: '0' 00000100h
This has disappeared in the new one:
10h dword Bit 0: '1' to launch the secondary loader in protected mode
All other bits: '0' 00000000h
Note: both versions of the document say release 1.00?
However, if I use the old bootload, VGA works fine....
Any ideas?
Many thanks,
MD.
(PS... attached 2 seperate bootloader docs)
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Attachments : LOADER.HTM :
https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006HttH&d=%2Fa%2F0X0000000aYO%2Fr4uy69ZFXYT1j4WPPYg.JhZ1h4HxcQPwtLWzkTkiUWY&asPdf=false
