On Sun, Aug 23, 2009 at 5:45 AM, Kevin O'Connor <[email protected]> wrote:
> 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). > dev->controller-bulk is memory is 5d2d, but the point which direct to dev->controller is 6Ef30,which physical memory is 6EF30+CE000>0x100000,what's why grub kernel can load some blocks to 0x100000 but crashed later. grub overwrite the space which usbrom use. So the problem is be confirmed with memory. Kevin, how can i use PMM by seabios from usbrom? it should be much about 1M memory that should be used. Does PMM can suppport so large or just 40K of low memory/64K high memory > > -Kevin > -- Jason Wang Peking University
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