Changes between Version 31 and Version 32 of ventana/errata


Ignore:
Timestamp:
05/02/2022 06:53:31 PM (5 months ago)
Author:
Tim Harvey
Comment:

added errata hw33 and hw34 regarding the GPY111 GbE PHY

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  • ventana/errata

    v31 v32  
    556556
    557557
     558
     559[=#hw33]
     560== HW33: GPY111 PHY replacement
     561Issue:
     562 * Due to supply chain limitations the DP83867 GbE PHY has been replaced with the GPY111 GbE PHY
     563
     564Resolution:
     565 * Software support which is already present in the latest Gateworks boot firmware is needed to support this PHY. If using older boot firmware the following patches are needed:
     566  - [https://github.com/Gateworks/u-boot-imx6/commit/2cc11afac1db919ef3f9f775f875e224ffaba010 board: gateworks: gw_ventana: add support for GPY111 PHY]
     567
     568Affected Products:
     569 - GW5913-D+ (PCB 02210202-03)
     570
     571Notes:
     572 - If your software has the required support the PHY will be shown in U-Boot as follows:
     573{{{
     574Net:   GPY111 eth0: ethernet@2188000
     575}}}
     576
     577
     578[=#hw34]
     579== HW34: GPY111 PHY bit error rate and link errata
     580
     581Issue:
     582 * The GPY111 PHY used has some errata from the manufacturer:
     583  1. When operating on a GbE link occasionally a link will have a high CRC error rate directly after a cable plug-in or board power-up event. A link down/up event will typically resolve this issue.
     584
     585Resolution:
     586 - Issue #1 is addressed internally by firmware in the PHY: If the PHY exceeds an allowed threshold of 'Start-of-Stream Delimiter' (SSD) errors it will restart link negotiation a number of times before finally giving up and will then 'Auto-Downspeed' (ADS) to a 100mbps link. This feature is configured by the PHY LSADS field (bit 15 - 14) of the PHY_PHYCTL2 MII register (0x14) where a value of 00b is Off (ADS disabled), 01B will retry 1 time, 10B will retry 3 times (default), and 11B will retry 4 times. An ADS event is signaled by the LSADS bit (bit 8) of the PHY_PHYSTAT1 (0x11) MII register being set. The overall affect of using ADS is that the link may not be stable until it has settled after the link is brought up and in rare cases the link may settle at 100mbps. In extensive testing it has been found that link retries occurs about 1 in 100 plug-in/power-up events, an Auto-Downspeed to 100m occurs less than 1 in 5000 plug-in/power-up events, and that the link is stable within 30 seconds.
     587
     588Affected Products:
     589 - GW5913-D+ (PCB 02210202-03)
     590
     591
     592