Messages in this thread | | | Date | Thu, 22 Apr 1999 08:20:07 +0000 | From | Timo Ketola <> | Subject | Qs: Kernel memory allocation; fbcon greyscale implementation |
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Hi folks,
I'm sorry if these are too trivial - but...
I have put Linux 2.2.5 into a nonstandard ix86 hardware (AMD Elan) - that is there is no BIOS, no VGA but an LCD display... Its working now but 3 questions arose:
1) Display hardware needs a memory block for it's frame buffer from the main ram aligned to a 64K boundary. How do I best allocate this. Now I reduced the memory size reported to the kernel and ioremap'ped the top memory block into the virtual memory. But as this is not in control of the driver I think its not the correct way.
2) The kernel message says that 412k of the memory is reserved. I'm afraid that the 640k-1M area is reserved and lost. If thats true, how can I get them back.
3) The display is 16 level gray scale, 4 bpp, 2 pixels in a byte. In what visual type does it map nicely. It seems to me that the fbcon treats it as a pseudocolor device. At least the appearing logo is indexed color picture - I think. I don't have very clear idea how this affects for example the applications. I think I saw a note somewhere about this kind of display but from the sources I don't get the idea how it shoulf be implemented.
Thanks in advance!
BTW, this is my first posting here so excuse me for any failures to follow the netiquette. And, of course, I don't mind being pointed to FAQs, docs or correct lists.
-- Timo
--
Epec Oy Timo Ketola Box 194 FIN-60101 Seinäjoki
timo.ketola@epec.fi
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