[U-Boot] [PATCH v2 1/2] mx6cuboxi: Fix Ethernet PHY detection problem

[Stefano Babic]

Hi Fabio,

On 04/05/2015 16:22, Fabio Estevam wrote:
> mx6cuboxi sometimes fails to recognize the Ethernet PHY:
> 
> Net:   Phy 0 not found
> 
> The explanation for this behavior comes from from Rabeeh Khoury:
> 
> "The LED_ACT pin on the carrier-one boards had a pull down that
> forces the phy address to 0x0; where on CuBox-i and the production
> HummingBoard that pin is connected directly to LED that depending
> on the pull down strength of the LED it might be sampled as '0' or '1' thus
> the phy address might appear as either address 0x0 or 0x4."
> 
> "This is AR8035 implementation; in reset stage the LED pin is configured as
> input, and pull up/down does matter. In this case it configures the PHY
> address.
> 
> After reset is deasserted the same LED pin becomes output and then
> according to the previous pull/up it should be active high/low"
> 
> One way to properly fix this behavior is to place external pull-up/down
> resistors in the LED line, but from a software standpoint we can fix it 
> by telling phy_find_by_mask() to scan the PHY at addresses
> 0x0 and 0x4.
> 
> Reported-by: Vagrant Cascadian <vagrant at aikidev.net>
> Signed-off-by: Rabeeh Khoury <rabeeh at solid-run.com>
> Signed-off-by: Fabio Estevam <fabio.estevam at freescale.com>
> ---

Applied to u-boot-imx, thanks !

Best regards,
Stefano Babic


-- 
=====================================================================
DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-53 Fax: +49-8142-66989-80 Email: sbabic at denx.de
=====================================================================