Hi Feng,
Now I understand the concept. I was expecting that PEIM would already be
available for the Minnowboard Max. Is Usb in the PEI phase not supported in
Minnowboard?
From my digging in the code today, it seems to enable the xhci controller,
it's PCI BAR needs to be set and enabled for memory access. I found memory
base addresses for some devices in
Vlv2DeviceRefCodePkg\ValleyView2Soc\NorthCluster\Include\PlatformBaseAddress
es.h but not for XHCI. From looking at the Atom E3800 datasheet, the xhci
memory base doesn't have a fixed location so I believe I need to pick an
unused range in the Low MMIO space to set as the xhci BAR.
If you or someone else on the list can recommend a different platform that
already supports xhci in the PEI phase to use as a development platform that
might be a better option for me.
Thank you again for your patience and prompt responses.
Eric
-Original Message-
From: Tian, Feng [mailto:feng.t...@intel.com]
Sent: Sunday, August 16, 2015 10:20 PM
To: Eric Wittmayer; edk2-devel@lists.01.org
Cc: Tian, Feng
Subject: RE: [edk2] Help debugging PEIM on Minnowboard Max
Do you look into the UsbController.h in MdeModulePkg/Include/Ppi
directory?
typedef
EFI_STATUS
(EFIAPI *PEI_GET_USB_CONTROLLER)(
IN EFI_PEI_SERVICES**PeiServices,
IN PEI_USB_CONTROLLER_PPI *This,
IN UINT8 UsbControllerId,
OUT UINTN *ControllerType,
OUT UINTN *BaseAddress
);
You need write a PEIM to produce this PPI and implement the above
interface according to your platform setting.
For how to write a PEIM module, you can refer to EDKII Module Writer's
Guide in edk2.sourceforge.net
Thanks
Feng
-Original Message-
From: Eric Wittmayer [mailto:e...@frescologic.com]
Sent: Monday, August 17, 2015 11:50
To: Tian, Feng; edk2-devel@lists.01.org
Subject: RE: [edk2] Help debugging PEIM on Minnowboard Max
Hi Feng,
I see now that XhciPei needs gPeiUsbControllerPpiGuid and creates
gPeiUsbHostControllerPpiGuid which UsbBusPei needs.
I can't seem to figure out what creates gPeiUsbControllerPpiGuid? I see
it
listed in the .dec file I'm using but that apparently isn't enough to
install the Ppi. What should be installing the gPeiUsbControllerPpiGuid?
Thanks,
Eric
-Original Message-
From: Tian, Feng [mailto:feng.t...@intel.com]
Sent: Sunday, August 16, 2015 6:09 PM
To: Eric Wittmayer; edk2-devel@lists.01.org
Cc: Tian, Feng
Subject: RE: [edk2] Help debugging PEIM on Minnowboard Max
Eric,
I must agree the naming of these usb pei related ppi guids are not
good, which misleads you.
There is no the chicken and egg problem. gPeiUsbHostControllerPpiGuid
and gPeiUsbControllerPpiGuid are two different ppis. The former is
consumed by UsbPei and the latter is consumed by XhciPei. You need
write a pei module to produce PeiUsbControllerPpi (see
MdeModulePkg/Include/Ppi for
definitions) at first.
Thanks
Feng
-Original Message-
From: edk2-devel [mailto:edk2-devel-boun...@lists.01.org] On Behalf Of
Eric Wittmayer
Sent: Saturday, August 15, 2015 08:12
To: edk2-devel@lists.01.org
Subject: [edk2] Help debugging PEIM on Minnowboard Max
I'm writing a PEIM for a USB3 device but having trouble even getting
the UsbBusPie and XhciPei modules to load during boot.
I thought getting the existing Usb Peims to load would be a good first
step.
I looked at the DEPEX for both of the above modules and tried removing
gEfiPeiBootInRecoveryModePpiGuid but I didn't see them load. If I
set both of their DEPEX == TRUE then I see some print statements that
show they are at least trying to load but then I have a chicken and
egg problem
in
that UsbBusPie needs either gPeiUsbHostControllerPpiGuid or
gPeiUsb2HostControllerPpiGuid which come from XhciPei. However,
XhciPei needs gPeiUsbControllerPpiGuid which comes from UsbBusPei
before it will install the gPeiUsb2HostControllerPpiGuid. The same
cross dependency is shown in the DEPEX for these two modules.
I feel like I'm missing something simple and fundamental and I'm
hoping someone will point me in the right direction.
Thanks,
Eric W
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