Messages in this thread | | | Subject | Re: [Fastboot] Re: Announce: dumpfs v0.01 - common RAS output API | From | (Eric W. Biederman) | Date | 29 Jul 2004 10:01:18 -0600 |
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"Martin J. Bligh" <mbligh@aracnet.com> writes:
> IIRC, what Adam did is to relocate the bottom 16MB of mem into the > reserved buffer and execute into the bottom 16MB. Yes, that probably does > leave some DMA issues that we should fix up as you suggest above, but I > think it's good enough for a first pass at the problem.
Probably. I have witnessed network RX causing memory corruption, before the kexec code started downing the network interfaces on the user space side. I suspect data capture from sound cards or video capture cards would have the same issue.
The way I have observed this in the past is to kexec memtest86, on a machine with known good memory, and then attempt to ping it :)
What especially worries me about the low 16MB is that it is the DMA zone for ISA devices. Old sound cards in particular. Most of that is output but....
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