linux-kernel - Re: [PATCH 6/7] tty/powerpc: introduce the ePAPR embedded hypervisor byte channel driver

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Message-ID: <4DD528E8.20203@freescale.com>
Date:	Thu, 19 May 2011 09:27:52 -0500
From:	Timur Tabi <timur@...escale.com>
To:	Greg KH <greg@...ah.com>
CC:	<kumar.gala@...escale.com>, <benh@...nel.crashing.org>,
	<akpm@...nel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-kernel@...r.kernel.org>, <linux-console@...r.kernel.org>
Subject: Re: [PATCH 6/7] tty/powerpc: introduce the ePAPR embedded hypervisor
 byte channel driver

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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