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add memory over pci, is it possible ?
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ddc
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Joined: 29 Aug 2006
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PostPosted: Tue Jan 26, 2010 1:52 pm    Post subject: add memory over pci, is it possible ? Reply with quote

hi
i got a ppc7450-1Ghz development board which has 128Mb soldered (wandering the reason why hw guys can be so foolish to solder ram without any expansion socket ... dunno at all, anyway) on board without any expansion ram socket

ram expansion is not possible with "just adding an other sodim/dimm/whateverdim ram"
you have to think different, ... and well, i have no ram sockets, but i have 4 pci bus 5v/32bit

so i wandering if it is possible to add ram using this way: PCI

for example graph video (i can't add any AGP) cards have >> 128Mb of video ram, pretty addressable on pci: so i wander if it is possible to map this video ram as system ram

it should be wonderful, cause the gentoo portage (and emerge) needs more ram than the 128Mb i have on the development board (this means a lot of swap activity, with a possible "segmentation fault", so adding more ram may save this ugly situation =P)


any idea ? suggestion ?
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roarinelk
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Joined: 04 Mar 2004
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PostPosted: Tue Jan 26, 2010 2:28 pm    Post subject: Reply with quote

There was a driver posted to LKML which did the VRAM-as-RAM thing a couple
of years ago.

I suppose you could do this yourself: set up the vram BAR for your graphics
card, and add the new ram using "add_memory_region()" in the kernel.

As for not enough RAM to compile stuff: that's what distcc is for ;-)
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gringo
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PostPosted: Wed Feb 03, 2010 3:46 pm    Post subject: Reply with quote

do you mean sth. like this ?

http://en.gentoo-wiki.com/wiki/Using_Graphics_Card_Memory_as_Swap

i don´t think there is much more you can do.

cheers
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