radeonfb: PLL? problems with radeon 7000 in embedded PPC

radeonfb: PLL? problems with radeon 7000 in embedded PPC

[Matevz Langus]

Hi everybody,

I am new in graphics in PPC and would like to ask if somebody can help
me.

I have a PPC (e500) embedded system with PCI bus and ATI Radeon 7000
with 64 MB DDR. PCI detects the card and opens all memory spaces as it
should.

However I have 2 problems:
- radeonfb driver detects SDRAM instead of DDR and also size is not
correct 192xxx kB instead of 64 MB.
- in function radeon_write_pll_regs system hangs in

	while ((INPLL(PPLL_REF_DIV) & PPLL_REF_DIV_MASK) !=
	       (mode->ppll_ref_div & PPLL_REF_DIV_MASK)) {
		OUTPLLP(PPLL_REF_DIV, mode->ppll_ref_div, 		~PPLL_REF_DIV_MASK);
	}

It loops in this while for ever.
Is the reason for this problem in PLL not locking?

I have seen that settings for PLL can be obtained from OF or BIOS. I
don't have anything like this in my embedded system.
How can I calculate appropriate values for PLL? Default ones are
obviously not correct.

Has anybody managed to use this card in embedded system without BIOS or
OF?

thanks,
  Matevz Langus


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Re: radeonfb: PLL? problems with radeon 7000 in embedded PPC

[Benjamin Herrenschmidt]

On Thu, 2004-04-01 at 08:10, Matevz Langus wrote:

> Has anybody managed to use this card in embedded system without BIOS or
> OF?

You cannot use such a card if it has not been properly initialized
by the firmware first. One solution is to use an x86 emulator to
run the x86 BIOS. If you are building embedded applications with
on board chipsets, ATI would probably have provided you with the
necessary init code.

Ben.


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