[U-Boot-Users] MII / RMII

[Ulf Samuelsson]

tor 2007-11-29 klockan 19:51 +0100 skrev Guennadi Liakhovetski:
> Hi,
> 
> 1. Does it make sense at all to define CONFIG_RMII without defining 
> CONFIG_MII? The question is meant not really theoretical as in what 
> meaning RMII has, rather how the macro CONFIG_RMII is supposed to be used? 
> For example, tests like
> 

I think that if you use an Ethernet and need to differentiate
between MII and RMII they should be mutually exclusive.
You either define CONFIG_RMII OR CONFIG_MII but not both.
If you have a PHY on the chip, then you do not define any of the two.
MII uses more pins and maybe different pins, so a port for a CPU
should differentiate.
If only RMII is supported by existing boards, then the driver
could be written in a sloppy way and hardwire the RMII 
configuration without using CONFIG_RMII.
Did not check the drivers so I can't tell.


> #if defined(CONFIG_MII) && defined(CONFIG_RMII)
> 
> isn't checking for CONFIG_MII redundant?
> 
> 2. cpu/at32ap/at32ap7000/gpio.c also tests CONFIG_RMII. at32ap is an AVR32 
> CPU and this macro is only defined in a few MPC8XX configurations, so, 
> this test doesn't seem to make much sense in the current tree.
> 
> 3. drivers/qe/uec_phy.c tests CONFIG_RMII_MODE, which doesn't occur 
> anywhere else in the tree. The driver is enabled in some MPC85xx and 
> MPC83xx configs.
> 
> 4. drivers/macb.c tests for "RMII or MII mode" by jest checking
> 
> #ifdef CONFIG_RMII
> ...
> #else
> ...
> #endif
> 
> i.e., not for
> 
> #elif defined CONFIG_MII
> 
> This driver is only enabled in include/configs/atstk1002.h, which is also 
> an AVR32 config, and it neither defines MII nor RMII.
> 
> Thanks
> Guennadi
> ---
> Guennadi Liakhovetski, Ph.D.
> 
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
> 
> -------------------------------------------------------------------------
> SF.Net email is sponsored by: The Future of Linux Business White Paper
> from Novell.  From the desktop to the data center, Linux is going
> mainstream.  Let it simplify your IT future.
> http://altfarm.mediaplex.com/ad/ck/8857-50307-18918-4
> _______________________________________________
> U-Boot-Users mailing list
> U-Boot-Users at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/u-boot-users
-- 
Best Regards
Ulf Samuelsson