Re: [rtl] Access Video ram from RTL interrupt routine

[kumsta <NOSPAM_christophe.kumsta@free.fr>]

Sheldon Hoffman wrote:
> I would like to write characters (state information) directly to VGA
> video ram from my RTLinux interrupt service routine (ISR) in an RTL
> 2.2 module (on Red Hat Linux 6.1).  I've used this technique to
> debug ISRs in DOS and have found it useful because it is very fast
> and it provides useful info even when the operating system crashes.
[...]
> Thanks in advance for your consideration!
> 

Hi,
  I'm not sure, but I've alway used the 0xA0000 address space for VGA
GRAPHIC remap,
and after switching to VGA mode.
I'm not sure that this physical address is used for ASCII buffer ...
Have you initialised the video mode ??

Chris.

-- 
don't forget to remove NOSPAM_ for reply
Kumsta Christophe <christophe.kumsta@free.fr>
Real-Time image processing developper
RT-Linux/RTAI ( Use the Source Luck !)