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Date:	Thu, 1 Mar 2007 13:35:26 -0500
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Stephen Hemminger" <shemminger@...ux-foundation.org>
Cc:	bryan.wu@...log.com, "Andrew Morton" <akpm@...ux-foundation.org>,
	jgarzik@...ox.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH -mm 3/5] Blackfin: on-chip ethernet MAC controller driver

On Thu 1 Mar 2007 10:52, Stephen Hemminger pondered:
> Wu, Bryan wrote:
> > Hi folks,
> >
> > Here is the blackfin on-chip ethernet MAC controller driver for Linux.
> >
> > Index: linux-2.6/drivers/net/Kconfig
> > ===================================================================
> > --- linux-2.6.orig/drivers/net/Kconfig	2007-03-01 11:39:14.000000000
> > +0800 +++ linux-2.6/drivers/net/Kconfig	2007-03-01 11:39:19.000000000
> > +0800 @@ -836,6 +836,50 @@
> >  	  module, say M here and read <file:Documentation/modules.txt> as well
> >  	  as <file:Documentation/networking/net-modules.txt>.
> >
> > +config BFIN_MAC
> > +	tristate "Blackfin 536/537 on-chip mac support"
> > +	depends on NET_ETHERNET && (BF537 || BF536) && (!BF537_PORT_H)
> > +	select CRC32
> > +	select BFIN_MAC_USE_L1 if DMA_UNCACHED_NONE
> > +	help
> > +	  This is the driver for blackfin on-chip mac device. Say Y if you want
> > it +	  compiled into the kernel. This driver is also available as a
> > module +	  ( = code which can be inserted in and removed from the running
> > kernel +	  whenever you want). The module will be called bfin_mac.
> > +
> > +config BFIN_MAC_USE_L1
> > +	bool "Use L1 memory for rx/tx packets"
> > +	depends on BFIN_MAC && BF537
> > +	default y
> > +	help
> > +	  To get maximum network performace, you should use L1 memory as rx/tx
> > buffers. +	  Say N here if you want to reserve L1 memory for other uses.
> > +
> > +config BFIN_TX_DESC_NUM
> > +	int "Number of transmit buffer packets"
> > +	depends on BFIN_MAC
> > +	range 6 10 if BFIN_MAC_USE_L1
> > +	range 10 100
> > +	default "10"
> > +	help
> > +	  Set the number of buffer packets used in driver.
> > +
> > +config BFIN_RX_DESC_NUM
> > +	int "Number of receive buffer packets"
> > +	depends on BFIN_MAC
> > +	range 20 100 if BFIN_MAC_USE_L1
> > +	range 20 800
> > +	default "20"
> > +	help
> > +	  Set the number of buffer packets used in driver
>
> The regular practice is to put these in a device include file, and not
> make them kernel configurable.
> Why would you want to make it tuneable at compile time?

It is to attempt to make it easier for our end users to configure&use.

Most people who use it, want to make some tweaks to the configuration based on 
their embedded platform. Rather than forcing everyone to make changes to a .c 
or .h file, we let them manage it in the .config (which is platforms specific 
anyway).

-Robin
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