daniel sheltraw wrote:
>
> Hello realtimers
>
> I have a function which writes to video memory in kernel-space (and the
> palette registers) after setting up the video mode using SVAGlib in
> user-space. I have used this function previously in a non-RT kernel
> module where it worked as expected. Now I am trying to use the same
> function in a RT kernel module and it keeps locking up my machine. So
> my question is: Is there some reason that I should not be able to write
> to video memory (at 0xA0000) under RTAI (or RTL)?
>
Hi Daniel,
In in the 2.2 kernels, you need to use the following to adjust the
physical address to the kernel virtual address as shown:
int init_module(void)
{
int err;
#if LINUX_VERSION_CODE >= 0x20100
GM = phys_to_virt(0xA0000);
#else
GM = (char *)0xA0000;
#endif
Regards, Stuart.
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