Hello *,
I try to integrate coreboot *libpayload usb stack* in a custom binary
for x86.
I already succeed integration of *ehci* for *qemu* and *core 2 duo*
platforms.
But things seems to be not so easy for *xhci*.
When I try to run coreboot master branch (with hash 8bf3f7a) on qemu
(version 2.7.0)
with following line :
% qemu-system-x86_64 -bios build/coreboot.rom -serial stdio -drive
if=none,id=usbstick,file=/tmp/qemu_usb.disk -usb -device
nec-usb-xhci,id=xhci -device usb-storage,bus=xhci.0,drive=usbstick
I get these output lines concerning xHCI controller (nec-usb-xhci) :
8<---
[..]
00:04.0 0194:1033.0 xHCI controller
xhci_init: regbase: 0xfe070000
xhci_init: caplen: 0x40
xhci_init: rtsoff: 0x1000
xhci_init: dboff: 0x2000
xhci_init: hciversion: 0.0
xhci_init: Unsupported xHCI version
[..]
--->8
The same result is reached with qemu-system-i386...
Is it the expected result on qemu?
I don't have any motherboard supported by coreboot, so I try a custom
binary on
a *Xeon* processor (processor D-1500).
The xHCI version is supported (hciversion: 1.0) but things turn bad when
starting
xHCI controller i.e xhci->opreg->usbcmd |= USBCMD_RS in *xhci_start* :
the program hangs...
The registers usbcmd and usbsts before this command seems to have proper
values (a usb key
is connected.)
8<---
[..]
xhci_start - usbcmd:0 - usbsts:11
[..]
--->8
This seems to be related to interrupter configuration. When I comment
out the two lines
in *xhci_reinit*
8<---
[..]
xhci->hcrreg->intrrs[0].erstba_lo = virt_to_phys(xhci->ev_ring_table);
xhci->hcrreg->intrrs[0].erstba_hi = 0;
[..]
--->8
xhci_start works as expected i.e not hangs.
But the sequence following with *NOOP* to test command ring and event
ring mechanism fails.
8<---
[..]
NOOP run #0
Transfer TRB (@0x8051700):
PTR_L 0x00000000
PTR_H 0x00000000
STATUS 0x00000000
CNTRL 0x00005c00
TL 0x0000
TDS 0x0000
C 0x0000
ISP 0x0000
CH 0x0000
IOC 0x0000
IDT 0x0000
TT 0x0017
DIR 0x0000
Command 23 (@0x8051700)
Warning: Timed out waiting for TRB_EV_CMD_CMPL.
Command ring is running
[..]
--->8
As I understand it is mandatory to have the first interrupter configure
to manage
at least one event ring (4.9.4 Event Ring Management - eXtensible Host
Controller Interface
Revision 1.1).
Does someone succeed with xHCI support for x86 board?
Did I miss something concerning xHCI configuration?
Thanks.
Have a nice day.
--
Jean-Jacques PITROLLE
Phone: +33 1 30 09 12 70
SYSGO S.A.S
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