[U-Boot] [PATCH v2 2/2] net: fec_mxc: Do not error out when FEC_TBD_READY

[Marek Vasut]

On Thursday, August 21, 2014 at 06:11:16 AM, Ye Li wrote:
> The TDAR bit is set when the descriptors are all out from TX ring, but the
> descriptor properly is in transmitting not READY.

I don't quite understand this, can you please rephrase ?

> These are two signals,
> and in Ic simulation, we found the TDAR always clear prior than the READY
> bit of last BD. In mx6solox, we use a latest version of FEC IP. It looks
> the intrinsic behave of TDAR bit is changed in this FEC version, not any
> bug in mx6sx.

OK, so this behavior is isolated to MX6SX and newer. Then any adjustment should 
focus solely on MX6SX and newer.

> There are some solutions for this problem. Which would be acceptable?
> 1. Change the TDAR polling to checking the READY bit in BD.

This would return the cache-grinding, so this is not nice.

> 2. Add polling the READY bit of BD after the TDAR polling.

If this would be isolated to MX6SX only, then that is doable.

> 3. Add a delay after the TDAR polling.

This is just work.

> 
> Best regards,
> Ye Li

Thanks for clarifying. Also, can you please stop top-posting when sending to 
mailing lists ?

Best regards,
Marek Vasut