Tool/software:
TDA4VM DP83867 RGMII， pcblayout cable length RX（RD0、RD1、RD2、RD3、RXC）:6500mil;TX（TD0、TD1、TD2、TD3、TXC）:6000mil
Tx internal delay and rx internal delay configurate to 0ns on circuit board currently, dts configurate as follow:
&wkup_pmx0 {
mcu_cpsw_pins_default: mcu-cpsw-pins-default {
pinctrl-single,pins = <
J721E_WKUP_IOPAD(0x0058, PIN_OUTPUT, 0) /* MCU_RGMII1_TX_CTL */
J721E_WKUP_IOPAD(0x005c, PIN_INPUT, 0) /* MCU_RGMII1_RX_CTL */
J721E_WKUP_IOPAD(0x0060, PIN_OUTPUT, 0) /* MCU_RGMII1_TD3 */
J721E_WKUP_IOPAD(0x0064, PIN_OUTPUT, 0) /* MCU_RGMII1_TD2 */
J721E_WKUP_IOPAD(0x0068, PIN_OUTPUT, 0) /* MCU_RGMII1_TD1 */
J721E_WKUP_IOPAD(0x006c, PIN_OUTPUT, 0) /* MCU_RGMII1_TD0 */
J721E_WKUP_IOPAD(0x0078, PIN_INPUT, 0) /* MCU_RGMII1_RD3 */
J721E_WKUP_IOPAD(0x007c, PIN_INPUT, 0) /* MCU_RGMII1_RD2 */
J721E_WKUP_IOPAD(0x0080, PIN_INPUT, 0) /* MCU_RGMII1_RD1 */
J721E_WKUP_IOPAD(0x0084, PIN_INPUT, 0) /* MCU_RGMII1_RD0 */
J721E_WKUP_IOPAD(0x0070, PIN_OUTPUT, 0) /* MCU_RGMII1_TXC */
J721E_WKUP_IOPAD(0x0074, PIN_INPUT, 0) /* MCU_RGMII1_RXC */
>;
};
mcu_mdio_pins_default: mcu-mdio1-pins-default {
pinctrl-single,pins = <
J721E_WKUP_IOPAD(0x008c, PIN_OUTPUT, 0) /* MCU_MDIO0_MDC */
J721E_WKUP_IOPAD(0x0088, PIN_INPUT, 0) /* MCU_MDIO0_MDIO */
>;
};
};
&mcu_cpsw {
pinctrl-names = "default";
pinctrl-0 = <&mcu_cpsw_pins_default &mcu_mdio_pins_default>;
};
&cpsw_port1 {
phy-mode = "rgmii-rxid";
phy-handle = <&phy0>;
};
&davinci_mdio {
phy0: ethernet-phy@0 {
reg = <0>;
ti,rx-internal-delay = <DP83867_RGMIIDCTL_2_00_NS>;
ti,tx-internal-delay = <DP83867_RGMIIDCTL_2_50_NS>;
ti,fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_8_B_NIB>;
rx-fifo-depth = <DP83867_PHYCR_FIFO_DEPTH_8_B_NIB>;
};
};
When TDA4VM as server, PC as client, Execute 'iperf3 -c 192.168.1.200 -i 1 -t 20 -u -b 500M' cmd on PC, TDA4VM rx data lose less than 0.1%,
But when TDA4VM as client, PC as server, Execute 'iperf3 -c 192.168.1.205 -i 1 -t 20 -u -b 500M' cmd on TDA4VM, TDA4VM tx data lose more than 60%.
What causes this ? Can I configure some parameters to reduce tx data lose?
