On 6/10/07, Carl-Daniel Hailfinger <[EMAIL PROTECTED]> wrote: > On 10.06.2007 06:40, RusH wrote: > > > > Im asking about reinitialization because I want to implement it in > > Memtest (memtest.org). I want to be able to setup memory controller the > > way I like and continue the test. Memtest is big (>100KB) and Im > > afraid it wont fit in cache so i need some real ram. That's where the > > 'jump to CAR, reinitialize controller, jump back to ram' idea comes > > from. Is it doable? > > Why not run Memtest from graphics card RAM? A few years ago, graphics > card RAM was really low quality, so periodic checksumming of any > software running there might be necessary.
Date: Wed, 30 May 2007 18:57:44 +0200 From: RusH <[EMAIL PROTECTED]> To: [email protected] Subject: using Graphics card ram as actual ram? Message-ID: <[EMAIL PROTECTED]> so yes, i was thinking about it :) > > Does reinitializing memory controller er destroy all the data in ram? > > Depends. Some embedded systems (like the OLPC laptop) put memory > into self-refresh for suspend-to-RAM and reinitialize the memory > controller on resume without losing any contents. However, I > wouldn't count on that for any recent non-embedded x86 system. What about AMD64 controller? I know I can change a lot of timings on it, but changing tCAS is not possible without reinitializing, that's why I want to be able to reinitialize on the fly. I read somewhere that reinitializing (memory allready set up earlier) without touching the mappings would be ok, but I want to be sure before starting coding (easier to ask than sit on it a good week and wonder why it doesnt work). I guess I'll have to check for myself. All I got now is two boards with KT133 chipset, and that doesnt look to be supported (but PLE133/CLE266 are similar, so maybe that code will do). -- Who logs in to gdm? Not I, said the duck. -- linuxbios mailing list [email protected] http://www.linuxbios.org/mailman/listinfo/linuxbios
