Primary Bootloader

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)

________________

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

Posted on July 14, 2004 at 12:07

hello,

I wan't to ask about the size of primary loader that you use.

Thanks.

Posted on November 01, 2004 at 08:48

Hi Mehanou,

Would would you like to ask?

It would probably be best to send me a private message.

Regards,

Martin.