Subject: Re: change proposal sys/arch/arm/ep93xx
To: None <port-arm@NetBSD.org,>
From: Jesse Off <joff@embeddedARM.com>
Date: 10/18/2005 10:46:40
>I port NetBSD to an EP9315-based board. And I want to some changes of
Great! Is this board available for purchase? Links?
> A. order priority of attaching device (attach.diff)
> MAC address is stored in seeprom via GPIO(I^2C) on this board. I want
> to find GPIO more before than epe0.
I wrote the epe driver for the TS-7200 board. This board has the MAC set by
the RedBoot firmware and IIRC, I just leave the value untouched. Just keep
in mind if you overwrite the MAC using some method specific to your board,
it will break the TS-7200 unless you make sure it happens only for your
> B. modify MDCDIV (mdcdiv.diff)
> MDCDIV is fixed with 32 in epe.c. I want to change it in config file.
Yes, this is a conservative, slow clock, but I don't think anything really
speed-critical happens with that clock, why do you think it needs to be sped
up/modified? A faster clock actually causes problems with the Micrel PHY on
the TS-7200. Anyway, your change to make it a #define is harmless, but like
Martin suggested, making it a #define draws more attention to it in source
code so it probably needs a good comment about what exactly it is. (MII
management clock divisor)
> C. write to PHY (phy.diff)
> It is written with EP9315 manual in this way.
> (omitted 1-3)
> 4. Put the PHY data into the PHY Data register
> 5. Issue the write command to write data to the register with
> the PHY
> 6. Wait until the write command is completed. Determine this
> by polling the MIIStatus_Busy Bit in MIIStatus Register.
> I think current code is 5->4->6. It doesn't work on this board.
This sounds reasonable. Honestly, I hardly remember writing that code and I
doubt I noticed there was an approved procedure in the datasheet. If I
understand the issue correctly, I'm surprised it worked at all on the
TS-7200. Good catch.