Hello,
I am new to u-boot code. I am reading the usb host controller code for root hub configuration. I have some queries regarding some code. If anyone has got understanding about it pls explain it to me.
In usb.c the core calls the usb controller driver (ehci-hcd.c) by issuing command GET_DESCRIPTOR to know the maximum packet size the endpoint supports.
It than once again calls the driver by issuing command SET_ADDRESS to give address 1 to root hub.
Than it issues command GET_DESCRIPTOR second time and this time creates a queue head and associated queue transfer descriptors. The code for this is in function ehci_submit_async() (drivers/usb/host/ehci-hcd.c). I am not getting the purpose of calling this function and what the usb core is achieving by calling it.
If anyone can throw some light on it.
Regards -- Puneet Sharma puneet.sharma@moschip.com
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