linux-kernel - Re: [uClinux-dev] m68k compile issue with 4.0.5

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Date:	Fri, 19 Jun 2015 00:13:13 +1000
From:	Greg Ungerer <gerg@...inux.org>
To:	Waldemar Brodkorb <wbx@...nadk.org>
CC:	uClinux development list <uclinux-dev@...inux.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [uClinux-dev] m68k compile issue with 4.0.5

Hi Waldemar,

On 17/06/15 15:42, Waldemar Brodkorb wrote:
> Hi Greg,
> Greg Ungerer wrote,
>> I don't have any compile (or runtime) problems with m5208evb_defconfig
>> on linux-4.0.5 either. That is close to what most people use with qemu.
>> What .config are you using?
> Are you sure the defconfig creates a bootable image?
>
> I still need at least two patches.
>
> http://cgit.openadk.org/cgi/cgit/openadk.git/tree/target/m68k/qemu-m68k/patches/4.0.5/qemu-coldfire.patch
> Without this one I get black screen.
>
> http://cgit.openadk.org/cgi/cgit/openadk.git/tree/target/m68k/qemu-m68k/patches/4.0.5/m68k-coldfire-fec.patch
> Without this one I get
> qemu: hardware error: mcf_fec_read: Bad address 0x1c4
> ...
> Abort
>
> Networking still does not work for me after booting with the two
> patches applied:
> fec fec.0 (unnamed net_device) (uninitialized): MDIO read timeout
> fec: probe of fec.0 failed with error -5
>
> Any idea?

The qemu fec driver does not emulate any type of attached phy
or properly support the mdio read/write register.

The attached patch to qemu implements really simple phy support.
Was enough for me to get linux probing and finding a phy.

Regards
Greg


View attachment "0001-m68k-add-simple-phy-support-to-fec-driver.patch" of type "text/x-patch" (2231 bytes)