Date: Mon, 17 Dec 2007 22:42:46 +0100 From: Bernd Walter <ticso@cicely12.cicely.de> To: Rafal Jaworowski <raj@semihalf.com> Cc: freebsd-arm@freebsd.org Subject: Re: MMC cards support Message-ID: <20071217214246.GV51627@cicely12.cicely.de> In-Reply-To: <4766E845.50304@semihalf.com> References: <20071213222654.GE17356@dracon.ht-systems.ru> <20071214090128.GM31230@cicely12.cicely.de> <20071214115226.0b2cb7e2@peedub.jennejohn.org> <20071214.062511.74732956.imp@bsdimp.com> <20071214153201.18c4c5ea@peedub.jennejohn.org> <47629E53.30404@semihalf.com> <20071214190825.GG17356@dracon.ht-systems.ru> <4766E845.50304@semihalf.com>
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On Mon, Dec 17, 2007 at 10:21:09PM +0100, Rafal Jaworowski wrote: > Stanislav Sedov wrote: > > On Fri, Dec 14, 2007 at 04:16:35PM +0100 Rafal Jaworowski mentioned: > >> We're probably getting a bit OT here, but just to clarify U-Boot networking > >> model of operation that was mentioned: MAC address is usually programmed by a > >> U-Boot network controller driver into relevant h/w registers upon every > >> network access, so provided a given interface was used at least once in U-Boot > >> (whatever net command), it should have the MAC addresss programmed correctly > >> when running in the kernel. Otherwise it is left untouched, which happens in > >> most of the cases with multiple integrated controllers -- usually only the > >> first one gets ever used, others are left unconfigured... > >> > > > > Well, I downloaded the entire kernel via tftp, so the controller was probably > > configured correctly. Probably, u-boot resets it after transfer (have not checked > > this yet). > > > > Typically U-Boot would not reset the MAC address, at least I'm not aware of > any net driver there that would do so. I had a look at AT91 net driver and the > whole picture is quite confusing: > > - U-Boot net driver programs the address into EMAC_SA2L/EMAC_SA2H > - FreeBSD/arm tries to retrieve it from ETH_SA1L/ETH_SA1H > > I don't know AT91 family, so am not sure which one should be used and where > the above disconnect comes from (some byte ordering confusion?), but this > might be the direct cause of your troubles.. The Interface has support for multiple MAC addresses so there is more than one register set, which are technically identic. Normaly one would assume that you start filling the lowest numbered registers, but you say that u-boot uses the second. I personally find it confusing to use the second of four sets. -- B.Walter http://www.bwct.de http://www.fizon.de bernd@bwct.de info@bwct.de support@fizon.de
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