Re: [PATCH 6/7] tty/powerpc: introduce the ePAPR embedded hypervisorbyte channel driver

From: Timur Tabi
Date: Thu May 19 2011 - 10:28:20 EST

Greg KH wrote:
> Why do this conversion in the driver? Shouldn't that be something that
> userspace worries about?

The udbg interface is a very early kernel printk interface. I don't know what
the "u" stands for, but "dbg" is for "debug". The udbg interface is removed
once a normal console driver kicks in.

This is why I need to specify the byte channel handle via Kconfig. This code is
used so early that not even the device tree is available.

All of the udbg_putc functions do this.

Timur Tabi
Linux kernel developer at Freescale

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