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pgeorgi
on June 5, 2019
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PSPTool Is a Swiss Army Knife for the Firmware of ...
The PSP is responsible for memory training and re-enabling after wake-up. So neutralizing might work (given that signatures can be tricked), but you have to be very careful to keep a sizable set of modules alive.
dataflow
on June 5, 2019
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What is "memory training"?
vardump
on June 5, 2019
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It's related to correcting DDR memory signal timing / clock skew.
dataflow
on June 5, 2019
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root
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Oh it's the timing calibration thing that happens on initialization? Didn't realize that's called memory training haha cool!
rurban
on June 6, 2019
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root
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That's probably what the unsigned data bodies are for. This data needs to be on the fast path.
agapon
on June 5, 2019
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Are you sure? I thought that that was what AGESA code is doing.
pgeorgi
on June 6, 2019
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Before Zen, yes. Since Zen, that's in PSP, presumably for the PSP's various other features.
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