powerpc/T4240QDS/eth: some fix for XFI

[karo-tx-uboot.git] / doc / README.t4240qds

diff --git a/doc/README.t4240qds b/doc/README.t4240qds
index ef8c75f3b2c853e219649fb6acb42079a72b04cd..3962fee7f215ddb1964205e0a99d999ff3bb4fb5 100644 (file)
--- a/doc/README.t4240qds
+++ b/doc/README.t4240qds
@@ -79,6 +79,25 @@ Board Features
                - High-speed serial flash
        Two Serial port
        Four I2C ports
+  XFI
+       XFI is supported on T4QDS-XFI board which removed slot3 and routed
+       four Lanes A/B/C/D to a SFP+ cages, which to house fiber cable or
+       direct attach cable(copper), the copper cable is used to emulate
+       10GBASE-KR scenario.
+       So, for XFI usage, there are two scenarios, one will use fiber cable,
+       another will use copper cable. An hwconfig env "fsl_10gkr_copper" is
+       introduced to indicate a XFI port will use copper cable, and U-boot
+       will fixup the dtb accordingly.
+       It's used as: fsl_10gkr_copper:<10g_mac_name>
+       The <10g_mac_name> can be fm1_10g1, fm1_10g2, fm2_10g1, fm2_10g2, they
+       do not have to be coexist in hwconfig. If a MAC is listed in the env
+       "fsl_10gkr_copper", it will use copper cable, otherwise, fiber cable
+       will be used by default.
+       for ex. set "fsl_10gkr_copper:fm1_10g1,fm1_10g2,fm2_10g1,fm2_10g2" in
+       hwconfig, then both four XFI ports will use copper cable.
+       set "fsl_10gkr_copper:fm1_10g1,fm1_10g2" in hwconfig, then first two
+       XFI ports will use copper cable, the other two XFI ports will use fiber
+       cable.
 
 Memory map
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