On 2/1/07, Roman Kononov kononov195-lbl@yahoo.com wrote:
I have Sun Ultra40 workstation. Southbridge is nVidia CrushK8-04/nforce 2200 (too many names, sounds like a criminal).
Linuxbios loads kernel A; kernel A loads kernel B. Everything works fine.
Then I push the reset button.
Linuxbios loads kernel A; kernel A loads kernel B. Kernel B complains
about wrong checksum of the mptable and crushes later.
An investigation showed that in 3), short after kernel A (v2.6.19.2) sets the Bus Master Enable bit of the nVidia's USB1 controller (pci_set_master()), the mptable gets two bytes at physical address 0x80 damaged.
Nothing is plugged to the USB ports. Other two Sun workstations had the same behavior. This does not make sense to me unless the controller has a HW bug.
I believe, this should better be fixed in the kernel USB driver.
For now this patch offers a possibility for linuxbios to reset the USB controller by setting HostControllerReset bit in HcCommandStatus Register. It is enablead by using 'register "usb1_hc_reset"="1"' in 'chip southbridge/nvidia/ck804' section of the mainboard's Config.lb.
Signed-off-by: Roman Kononov kononov195-lbl@yahoo.com
Acked-by: Ronald G. Minnich rminnich@gmail.com Committed revision 2546.