[coreboot] usbrom debugging

Kevin O'Connor kevin at koconnor.net
Sat Aug 22 23:45:04 CEST 2009

On Sun, Aug 23, 2009 at 04:03:40AM +0800, Jason Wang wrote:
> Hi all,
>     I am trying to debug why the grub crashed (under usbrom) after loading
> certain blocks into the memory.
> My new found is that while usbrom is trying to load (block lba=0x0019a9e0).
> it crashed. the flow is
> usb_new_read(0,0x0019a9e0,0x20,0xfffa2000), 0x20 is the count which should
> be read, and the 0xfffa2000 is the
> virtual address of (0x70000).
> usb_new_read call readwrite_blocks then execute_command. after executed
> wrap_cbw in execute_command.
> it should call dev->controller->bulk, this address is a wrong address. my
> debug information are below:

Where in memory is "dev->controller->bulk"?  You way want to check if
its contents were overwritten by something (eg, grub, linux, seabios,
or a data block loaded by the usb rom).


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