[U-Boot] [PATCH V7] ARM: mx6: Add support for Kosagi Novena

Marek Vasut
2014-10-14T21:38:35Z

On Sunday, October 12, 2014 at 08:33:21 AM, Sean Cross wrote:
> On 12/10/2014 05:04, Fabio Estevam wrote:
> > On Sat, Oct 11, 2014 at 11:21 AM, Sean Cross <xobs@kosagi.com> wrote:
> >>> Ok, understood. Just curious: which Ethernet PHY is used on the novena
> >>> board?
> >>
> >> It's the same Micrel PHY used on the Sabrelite, the KSZ9021.
> >
> > nitrogen/sabrelite holds Ethernet PHY reset low for 10ms, which is in
> > accordance with ksz9021 datasheet.
> >
> > Shouldn't we wait 10ms here as well?
>
> The reference manual for the PHY indicates that you should hold reset
> low for 10ms after the supply voltage stabilizes. So long as it takes
> at least 10msto get from the point at which the CPU starts executing its
> ROM code to the point at which the reset line is toggled, we will be fine.

This definitelly is the case, so I presume we don't need the delay ?

Best regards,
Marek Vasut