For Sierra SerDes Instance 1 on J721e, the Lane Control is not implemented correctly.

Please refer to the following lines.

https://bitbucket.itg.ti.com/projects/PROCESSOR-SDK/repos/common-csl-ip/browse/src/ip/serdes_cd/V0/csl_serdes3.c#75

 

        if(serdesInstance != CSL_TORRENT_SERDES0)
        {
            if(phyInstanceNum == 0)
            {
                if(serdeslaneNum == 0)
                {
                    /* Enet Switch Q/SGMII Lane 1 */
                    CSL_FINSR(*(volatile uint32_t *)(uintptr_t)(mainCtrlMMRbaseAddr + CSL_MAIN_CTRL_MMR_CFG0_SERDES0_LN0_CTRL),1,0,0x0);
                }
                else if(serdeslaneNum == 1)
                {
                    /* Enet Switch Q/SGMII Lane 2 */
                    CSL_FINSR(*(volatile uint32_t *)(uintptr_t)(mainCtrlMMRbaseAddr + CSL_MAIN_CTRL_MMR_CFG0_SERDES0_LN1_CTRL),1,0,0x0);
                }
                else if(serdeslaneNum == 2)
                {
                    /* Enet Switch Q/SGMII Lane 3 */
                    CSL_FINSR(*(volatile uint32_t *)(uintptr_t)(mainCtrlMMRbaseAddr + CSL_MAIN_CTRL_MMR_CFG0_SERDES1_LN0_CTRL),1,0,0x0);
                }
                else if(serdeslaneNum == 3)
                {
                    /* Enet Switch Q/SGMII Lane 4 */
                    CSL_FINSR(*(volatile uint32_t *)(uintptr_t)(mainCtrlMMRbaseAddr + CSL_MAIN_CTRL_MMR_CFG0_SERDES1_LN1_CTRL),1,0,0x0);
                }
            }

 

Instead of checking if serdeslaneNum == 2 or 3 under instance 0, it should check if it is instance 1 and then check if it is for lane 0 and lane 1.

Sierra only has 2 lanes per instance.