[U-Boot] [PATCH] powerpc/T4240QDS/eth: some fix for XFI

[York Sun]

On 08/07/2014 01:43 AM, shh.xie at gmail.com wrote:
> From: Shaohui Xie <Shaohui.Xie at freescale.com>
> 
> XFI is supported on T4QDS-XFI board, which removed slot3, and four LANEs
> of serdes2 are routed to a SFP+ cages, which to house fiber cable or
> direct attach cable(copper), the copper cable is used to emulate the
> 10GBASE-KR scenario.
> 
> So, for XFI usage, there are two scenarios, one will use fiber cable,
> another will use copper cable. For fiber cable, there is NO PHY, while
> for copper cable, we need to use internal PHY which exist in Serdes to
> do auto-negotiation and link training, which implemented in kernel.
> We use hwconfig to define cable type for XFI, and fixup dtb based on the
> cable type.
> 
> For copper cable, set below env in hwconfig:
> 
> fsl_10gkr_copper:<10g_mac_name>
> 
> the <10g_mac_name> can be fm1_10g1, fm1_10g2, fm2_10g1, fm2_10g2. The
> four <10g_mac_name>s do not have to be coexist in hwconfig. For XFI ports,
> if a given 10G port will use the copper cable for 10GBASE-KR, set the
> <10g_mac_name> of the port in hwconfig, otherwise, fiber cable will be
> assumed to be used for the port.
> 
> For ex. if four XFI ports will both use copper cable, the hwconfig
> should contain:
> 
> fsl_10gkr_copper:fm1_10g1,fm1_10g2,fm2_10g1,fm2_10g2
> 
> For fiber cable:
> 
> 1. give PHY address to a XFI port, otherwise, the XFI ports will not be
> available in U-boot, there is no PHY physically for XFI when using fiber
> cable, this is just to make U-boot happy and we can use the XFI ports
> in U-boot.
> 2. fixup dtb to use fixed-link in case of fiber cable which has no PHY.
> Kernel requests that a MAC must have a PHY or fixed-link.
> 
> When using XFI protocol, the MAC 9/10 on FM1 should init as 10G interface.
> 
> Change serdes 2 protocol 56 to 55 which has same feature as 56 since 56
> is not valid any longer.
> 
>
Shaohui,

Do you mind to put this information into a README file?

York