Messages in this thread | | | Subject | Re: Make sure we populate the initroot filesystem late enough | From | Benjamin Herrenschmidt <> | Date | Tue, 27 Feb 2007 07:46:39 +0100 |
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> USB controller issues? We used to have these really hard-to-debug problems > with the USB controller being active and having had the BIOS set up the > command queues etc. Really subtle. It's why we now have PCI quirks for > shutting up (most) USB controllers very early.
On powermacs or powerbooks, the USB controller is shut down by the firmware when we call the "quiesce" OF call from prom_init.c, which happens before the kernel relocates itself to 0 and takes over memory. Unless we fucked up something in there, I wouldn't expect that to be the cause.
> If there is some USB controller that we miss, or that sets up its command > chain to some unexpected area (so that USB is active and corrupting memory > even very early on), that could explain it.
Did we setup the OHCI controller when the crash happen ? Maybe we broke something subtle in the USB stack ?
Ben.
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