[Devil-linux-develop] xHCI and USB boot problem on modern MBs

[Andrzej O. <an...@ma...>]

Dear Heiko,

We have a problem with booting and loading D-L configurations on modern 
motherboards (eg with Intel 87 series chipsets). There is no longer the old 
USB controllers, but only the new USB 3.0, requiring drivers xHCI-hcd. 
Meanwhile, the driver has EXPERIMENTAL status and by default is configured as 
a module CONFIG_USB_XHCI_HCD=m, while other usb host drivers are linked into 
the kernel.

During the init script execution host driver is not loaded yet and on such 
motherboards init script is fail to find a boot image and/or configuration, if 
it is on USB mass storage.

You could modify the init script in the initrd for load xhci-hcd driver 
explicite and add the apropriate host drivers to the initrd but probably 
easier and more systematic is to link xHCI controller driver into the kernel, 
changing CONFIG_USB_XHCI_HCD=m to CONFIG_USB_XHCI_HCD=y

In my D-L compilations such change fixes the problem.

Regards

Andrzej Odyniec


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