参考资料：
[1].米联ZYNQ7Z020系列的以太网网口芯片RTL8211FD自适应速度的解决方案（good）
[2].RTL8211（工/商）业级网口芯片bsp自适应修改vivado2019.2
[3].vitis-sdk-lwip RTL8211FD(I)业级网口芯片自适应修改最简办法
原因：XILINX官方默认的lwip bsp驱动暂时不支持RTL8211网口芯片。
问题现象如下：
解决办法：
手动修改lwip库文件以支持该芯片,不同版本工具之间的修改方式大同小异。
vivado2019.1（参考[1]）
步骤1：在工程的BSP中选择lwpi211，如图1。
步骤2：lwip的选项phy_link_speed设为Autodetect，如图2.
步骤3：修改工程中xemacpsif _physpeed.c中的get_Realtek_phy_speed()函数，注释原来的代码，然后用米联客的替代。如图3及代码。
步骤4：重新编译工程即可。
工业级RTL8211对应的代码（速度信息在寄存器0x1A中），参考[2]. 商业级RTL8211对应的代码也在参考[2]中。
//工业级RTL8211的代码（注释掉原来代码）
static u32_t get_Realtek_phy_speed (XEmacPs *xemacpsp, u32_t phy_addr)
{
u16_t control;
u16_t status;
u16_t status_speed;
u32_t timeout_counter = 0;
u32_t temp_speed;
xil_printf("Start PHY autonegotiation \r\n");
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, &control);
control |= IEEE_ASYMMETRIC_PAUSE_MASK;
control |= IEEE_PAUSE_MASK;
control |= ADVERTISE_100;
control |= ADVERTISE_10;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, control);
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,
&control);
control |= ADVERTISE_1000;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,
control);
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);
control |= IEEE_CTRL_AUTONEGOTIATE_ENABLE;
control |= IEEE_STAT_AUTONEGOTIATE_RESTART;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);
control |= IEEE_CTRL_RESET_MASK;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);
while (1) {
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);
if (control & IEEE_CTRL_RESET_MASK)
continue;
else
break;
}
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);
xil_printf("Waiting for PHY to complete autonegotiation.\r\n");
while ( !(status & IEEE_STAT_AUTONEGOTIATE_COMPLETE) ) {
sleep(1);
timeout_counter++;
if (timeout_counter == 30) {
xil_printf("Auto negotiation error \r\n");
return XST_FAILURE;
}
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);
}
xil_printf("autonegotiation complete \r\n");
XEmacPs_PhyRead(xemacpsp, phy_addr,0X1A,
&status_speed); /* 工业级 RTL8211 */
if (status_speed & 0x04) {
temp_speed = status_speed & 0x30;
if (temp_speed == 0x20)
return 1000;
else if(temp_speed == 0x10)
return 100;
else
return 10;
}
return XST_FAILURE;
}
//商业级RTL8211的代码
static u32_t get_Realtek_phy_speed(XEmacPs *xemacpsp, u32_t phy_addr)
{
u16_t control;
u16_t status;
u16_t status_speed;
u32_t timeout_counter = 0;
u32_t temp_speed;
xil_printf("Start PHY autonegotiation \r\n");
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, &control);
control |= IEEE_ASYMMETRIC_PAUSE_MASK;
control |= IEEE_PAUSE_MASK;
control |= ADVERTISE_100;
control |= ADVERTISE_10;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, control);
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,
&control);
control |= ADVERTISE_1000;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,
control);
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);
control |= IEEE_CTRL_AUTONEGOTIATE_ENABLE;
control |= IEEE_STAT_AUTONEGOTIATE_RESTART;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);
control |= IEEE_CTRL_RESET_MASK;
XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);
while (1) {
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);
if (control & IEEE_CTRL_RESET_MASK)
continue;
else
break;
}
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);
xil_printf("Waiting for PHY to complete autonegotiation.\r\n");
while ( !(status & IEEE_STAT_AUTONEGOTIATE_COMPLETE) ) {
sleep(1);
timeout_counter++;
if (timeout_counter == 30) {
xil_printf("Auto negotiation error \r\n");
return XST_FAILURE;
}
XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);
}
xil_printf("autonegotiation complete \r\n");
XEmacPs_PhyRead(xemacpsp, phy_addr,0x11,
&status_speed); /* Commercial RTL8211*/
if (status_speed & 0x400) {
temp_speed = status_speed & 0xc000;
if (temp_speed == 0x8000)
return 1000;
else if(temp_speed == 0x4000)
return 100;
else
return 10;
}
return XST_FAILURE;
}
Vitis的修改方法
参考[2](lwip211_v1.1)和[3](lwip211_v2.0)
