Re: Re: 2.6.12-rc1-mm2 -- nvidiafb driver gives black screen

["Antonino A. Daplas" <adaplas@hotpop.com>]

On Friday 15 April 2005 02:19, Miles Lane wrote:
> Perhaps I am mistaken, but I thought Andrew wanted to see the nvidiafb
> driver work with a default X86 kernel configuration (which allows for
> up to 128M to be allocated).  Is the driver attempting to allocate
> exactly 128M because that is how much video ram is present in my video
> card?
>

Not allocation, as standalone cards have already a fixed amount of RAM. The
patch will limit the amount of video RAM that the kernel can access to a
maximum of 128 MiB.

> If lots of video cards exist that have more than 128M of video ram,
> won't we be seeing many boot problems with the default kernel
> configuration?  Does this point to a problem in the kernel design?  Is
> this limitation in the kernel's default configuration advantageous?
>

The patch is a short-term workaround where cards with large amounts
of video RAM eat a large amount of the kernel's address space.

What I intend to do is to mimic what radeonfb is doing. Ie, info->screen_size
points to the actual vram, while fix->smem_len points to ioremapped area only.
I'll do some testing first since nvidiafb uses the last chunk of the ioremapped
vram for the DMA buffer, and I don't know the consequence if this buffer is
unintentionally exported to user space, from the security point of view.

Tony




-------------------------------------------------------
SF email is sponsored by - The IT Product Guide
Read honest & candid reviews on hundreds of IT Products from real users.
Discover which products truly live up to the hype. Start reading now.
http://ads.osdn.com/?ad_id=6595&alloc_id=14396&op=click