https://community.nxp.com/t5/S32G/Gmac-loopback-problems/m-p/1443818#M719 <P>The registers in your pasted picture is belong to GMAC DMA channel 0 Tx and Rx descriptor ring.</P> <P>That is reasonable when using difference compile project, the Tx, Rx descriptor ring location change when use difference compile environment. That isn't one problem.</P> <P>The reason of "<STRONG>GMAC_STATUS_BUSY</STRONG>", please check whether the GMAC clock is locked or not.</P> <P>Please check the MC_CGM_0&nbsp; MUX_9, MUX_10, MUX_11 and MUX_15.</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>The clock chart is as below picture:</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="yiliu_b16664_0-1649914297250.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/176892iC7A9821AB3A24ED7/image-size/large?v=v2&amp;px=999" role="button" title="yiliu_b16664_0-1649914297250.png" alt="yiliu_b16664_0-1649914297250.png" /></span></P> <P>&nbsp;</P> Thu, 14 Apr 2022 05:33:59 GMT Yi_Liu_Nxa22412 2022-04-14T05:33:59Z https://community.nxp.com/t5/S32G/Gmac-loopback-problems/m-p/1436879#M674 <P>hi， nxp：</P><P>According to the protocol stack demo of tcp/ip stack, we changed the compilation environment from the previous windows to linux, and then the loopback mode of GMAC could not succeed.</P><P>The function&nbsp;Gmac_Ip_GetTransmitStatus return value is <STRONG>GMAC_STATUS_BUSY.</STRONG></P><P><STRONG>we compare the two compilation environment GMAC regs value as picture bellow.</STRONG></P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="nioer_0-1648714594568.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/175449i3FA6E3164EBE92F6/image-size/large?v=v2&amp;px=999" role="button" title="nioer_0-1648714594568.png" alt="nioer_0-1648714594568.png" /></span></P><P>&nbsp;</P> Thu, 31 Mar 2022 08:16:48 GMT https://community.nxp.com/t5/S32G/Gmac-loopback-problems/m-p/1436879#M674 nioer 2022-03-31T08:16:48Z https://community.nxp.com/t5/S32G/Gmac-loopback-problems/m-p/1443818#M719 <P>The registers in your pasted picture is belong to GMAC DMA channel 0 Tx and Rx descriptor ring.</P> <P>That is reasonable when using difference compile project, the Tx, Rx descriptor ring location change when use difference compile environment. That isn't one problem.</P> <P>The reason of "<STRONG>GMAC_STATUS_BUSY</STRONG>", please check whether the GMAC clock is locked or not.</P> <P>Please check the MC_CGM_0&nbsp; MUX_9, MUX_10, MUX_11 and MUX_15.</P> <P>&nbsp;</P> <P>&nbsp;</P> <P>The clock chart is as below picture:</P> <P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="yiliu_b16664_0-1649914297250.png" style="width: 999px;"><img src="https://community.nxp.com/t5/image/serverpage/image-id/176892iC7A9821AB3A24ED7/image-size/large?v=v2&amp;px=999" role="button" title="yiliu_b16664_0-1649914297250.png" alt="yiliu_b16664_0-1649914297250.png" /></span></P> <P>&nbsp;</P> Thu, 14 Apr 2022 05:33:59 GMT https://community.nxp.com/t5/S32G/Gmac-loopback-problems/m-p/1443818#M719 Yi_Liu_Nxa22412 2022-04-14T05:33:59Z