On 11/02/2017 05:29 AM, Lucian Cojocar wrote:
What is the impact of having no IOMMU support? Is it just that most of
the devices won't work? Or is it that I won't be able to access (and
run) from the main DRAM?
Sorry for not getting back to you sooner!
It means that you wouldn't be able to attach physical devices to a VM
and the system wouldn't be protected from DMA attacks.
My goal is to run some memory reliability tests with (a modified)
memtest. In terms of IO, it would be enough if I get the serial working
after coreboot+payload and also if I can access the DRAM controller (via
some PCI addresses). I'm mostly interested in playing with the part of
coreboot (actually AGESA) that does the initialization of the memory
controller. For these tests I only need one core.
Good luck :]
I eagerly await the results.
An extra feature would be to be able to revert to old BIOS -- for this I
plan to re-program the flash with its initial contents by using some
soldering/clips. Is there a easier way? e.g. can I do it from my
/hopefully somewhat functional/ coreboot?
You can flash the BIOS from coreboot yes
Coreboot>OEM
OR
coreboot>coreboot
but not
OEM>coreboot (as the CMOS needs resetting manually if you do this
according to the wiki)
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