针对VITIS无法支持的以太网芯片的LWIP库修改方法以（YT8531DH为例）

第一步:自定义LWIP库版本号修改

复制一份你安装的版本的软件最新的库

修改如下文件：

修改lwip211.mld文件中的版本标识（如将OPTION VERSION =1.5;改为2.0），尽量改大一些，避免Vitis环境缓存旧库

第二步:修改LWIP库文件新增以太网芯片的适配

需要修改xemacpsif_physpeed.c或者xaxiemacif_physpeed.c文件，分别对应了ARM自带的以太网接口使用MIO实现以太网功能LWIP部分修改和PL部分基于AXI总线gig_ethernet_pcs_pma 以太网IP 扩展以太网使用 LWIP需要修改的文件。

1:添加，YT8531的PHY标识符

xemacpsif_physpeed.c或者xaxiemacif_physpeed.c文件中增加如下定义

2:ARM自带的以太网接口xemacpsif_physpeed.c文件修改

第一个修改位置：

1. void detect_phy(XEmacPs *xemacpsp)

2. {

3.     u16_t phy_reg;

4.     u32_t phy_addr;

5.     u32_t emacnum;

6. 
   

7.     if (xemacpsp->Config.BaseAddress == XPAR_XEMACPS_0_BASEADDR)

8.         emacnum = 0;

9.     else

10.         emacnum = 1;

11.     for (phy_addr = 31; phy_addr > 0; phy_addr--) {

12.         XEmacPs_PhyRead(xemacpsp, phy_addr, PHY_DETECT_REG,

13.                             &phy_reg);

14. 
    

15.         if ((phy_reg != 0xFFFF) &&

16.             ((phy_reg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {

17.             /* Found a valid PHY address */

18.             LWIP_DEBUGF(NETIF_DEBUG, ("XEmacPs detect_phy: PHY detected at address %d.\r\n",

19.                                                                     phy_addr));

20.             if (emacnum == 0)

21.                 phymapemac0[phy_addr] = TRUE;

22.             else

23.                 phymapemac1[phy_addr] = TRUE;

24. 
    

25.             XEmacPs_PhyRead(xemacpsp, phy_addr, PHY_IDENTIFIER_1_REG,

26.                             &phy_reg);

27.             if ((phy_reg != PHY_MARVELL_IDENTIFIER) &&

28.                 (phy_reg != PHY_TI_IDENTIFIER) &&

29.                 (phy_reg != PHY_REALTEK_IDENTIFIER) &&

30.                 (phy_reg != PHY_YT8531_IDENTIFIER))

31.                

32.                  {

33.                 xil_printf("WARNING: Not a Marvell or TI or Realtek or YT8531 Ethernet PHY. Please verify the initialization sequence\r\n");

34.             }

35.         }

36.     }

37. }

第二个修改的位置：

1. static u32_t get_IEEE_phy_speed(XEmacPs *xemacpsp, u32_t phy_addr)

2. {

3.     u16_t phy_identity;

4.     u32_t RetStatus;

5. 
   

6.     XEmacPs_PhyRead(xemacpsp, phy_addr, PHY_IDENTIFIER_1_REG,

7.                     &phy_identity);

8.     if (phy_identity == PHY_TI_IDENTIFIER) {

9.         RetStatus = get_TI_phy_speed(xemacpsp, phy_addr);

10.     } else if (phy_identity == PHY_REALTEK_IDENTIFIER) {

11.         RetStatus = get_Realtek_phy_speed(xemacpsp, phy_addr);

12.     } else if (phy_identity == PHY_YT8531_IDENTIFIER) {

13.         RetStatus = get_YT8531_phy_speed(xemacpsp, phy_addr);

14.     } else {

15.         RetStatus = get_Marvell_phy_speed(xemacpsp, phy_addr);

16.     }

17. 
    

18.     return RetStatus;

19. }

第三个修改位置：

复制代码中已经有的get_Realtek_phy_speed函数，修改为，get_YT8531_phy_speed函数，并且对读取的速率寄存器部分修改，读取的值含义对照YT8531芯片手册进行速率部分转换为1000/100/10三种速度

1. static u32_t get_YT8531_phy_speed(XEmacPs *xemacpsp, u32_t phy_addr)

2. {

3.     u16_t control;

4.     u16_t status;

5.     u16_t status_speed;

6.     u32_t timeout_counter = 0;

7.     u32_t temp_speed;

8. 
   

9. xil_printf("Start YT8531 PHY autonegotiation \r\n");

10. 
    

11.     XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, &control);

12.     control |= IEEE_ASYMMETRIC_PAUSE_MASK;

13.     control |= IEEE_PAUSE_MASK;

14.     control |= ADVERTISE_100;

15.     control |= ADVERTISE_10;

16.     XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, control);

17. 
    

18.     XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,

19.                     &control);

20.     control |= ADVERTISE_1000;

21.     XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,

22.                     control);

23. 
    

24.     XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);

25.     control |= IEEE_CTRL_AUTONEGOTIATE_ENABLE;

26.     control |= IEEE_STAT_AUTONEGOTIATE_RESTART;

27.     XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);

28. 
    

29.     XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);

30.     control |= IEEE_CTRL_RESET_MASK;

31.     XEmacPs_PhyWrite(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);

32. 
    

33.     while (1) {

34.         XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);

35.         if (control & IEEE_CTRL_RESET_MASK)

36.             continue;

37.         else

38.             break;

39.     }

40. 
    

41.     XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);

42. 
    

43.     xil_printf("Waiting for PHY to complete autonegotiation.\r\n");

44. 
    

45.     while ( !(status & IEEE_STAT_AUTONEGOTIATE_COMPLETE) ) {

46.         sleep(1);

47.         timeout_counter++;

48. 
    

49.         if (timeout_counter == 30) {

50.             xil_printf("Auto negotiation error \r\n");

51.             return XST_FAILURE;

52.         }

53.         XEmacPs_PhyRead(xemacpsp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);

54.     }

55.     xil_printf("autonegotiation complete \r\n");

56. 
    

57. //YT8531 REG

58.     XEmacPs_PhyRead(xemacpsp, phy_addr,0X11,&status_speed);

59.     status_speed = status_speed>>8;

60. 
    

61.     if (status_speed & 0x04) {

62.         temp_speed = status_speed & 0xc0;

63. 
    

64.         if (temp_speed == 0x80)

65.             return 1000;

66.         else if(temp_speed == 0x40)

67.             return 100;

68.         else

69.             return 10;

70. 
    

71.     }

72.     return XST_FAILURE;

73. }

1. detect_phy函数中增加对该PHY的识别

2. static int detect_phy(XAxiEthernet *xaxiemacp)

3. {

4.     u16 phy_reg;

5.     u16 phy_id;

6.     u32 phy_addr;

7. 
   

8.     for (phy_addr = 31; phy_addr > 0; phy_addr--)

9.     {

10.         if(PHY_ADDR_CNT_UP)

11.             phy_addr = 32 - phy_addr;

12. 
    

13.         XAxiEthernet_PhyRead(xaxiemacp, phy_addr, PHY_DETECT_REG,

14.                                 &phy_reg);

15. 
    

16.         if ((phy_reg != 0xFFFF) &&

17.             ((phy_reg & PHY_DETECT_MASK) == PHY_DETECT_MASK)) {

18.             /* Found a valid PHY address */

19.             LWIP_DEBUGF(NETIF_DEBUG, ("XAxiEthernet detect_phy: PHY detected at address %d.\r\n", phy_addr));

20.             LWIP_DEBUGF(NETIF_DEBUG, ("XAxiEthernet detect_phy: PHY detected.\r\n"));

21.             XAxiEthernet_PhyRead(xaxiemacp, phy_addr, PHY_IDENTIFIER_1_REG,

22.                                         &phy_reg);

23.             if ((phy_reg != PHY_MARVELL_IDENTIFIER) &&

24.                     (phy_reg != TI_PHY_IDENTIFIER) &&

25.                     (phy_reg != PHY_REALTEK_IDENTIFIER)&&

26.                     (phy_reg != PHY_YT8531_IDENTIFIER)

27.                     ){

28.                 xil_printf("WARNING: Not a Marvell or TI Ethernet PHY. Please verify the initialization sequence\r\n");

29.             }

30.             phyaddrforemac = phy_addr;

31.             return phy_addr;

32.         }

33. 
    

34.         XAxiEthernet_PhyRead(xaxiemacp, phy_addr, PHY_IDENTIFIER_1_REG,

35.                 &phy_id);

36. 
    

37.         if (phy_id == PHY_XILINX_PCS_PMA_ID1) {

38.             XAxiEthernet_PhyRead(xaxiemacp, phy_addr, PHY_IDENTIFIER_2_REG,

39.                     &phy_id);

40.             if (phy_id == PHY_XILINX_PCS_PMA_ID2) {

41.                 /* Found a valid PHY address */

42.                 LWIP_DEBUGF(NETIF_DEBUG, ("XAxiEthernet detect_phy: PHY detected at address %d.\r\n",

43.                             phy_addr));

44.                 phyaddrforemac = phy_addr;

45.                 return phy_addr;

46.             }

47.         }

48.     }

49. 
    

50.     LWIP_DEBUGF(NETIF_DEBUG, ("XAxiEthernet detect_phy: No PHY detected.  Assuming a PHY at address 0\r\n"));

51. 
    

52.         /* default to zero */

53.     return 0;

54. }

第二个修改位置:

get_IEEE_phy_speed函数中，增加对以太网芯片速率识别的调用

1. unsigned get_IEEE_phy_speed(XAxiEthernet *xaxiemacp)

2. {

3.     u16 phy_identifier;

4.     u16 phy_model;

5.     u8 phytype;

6. 
   

7. #ifdef XPAR_AXIETHERNET_0_BASEADDR

8.     u32 phy_addr = detect_phy(xaxiemacp);

9. 
   

10.     /* Get the PHY Identifier and Model number */

11.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr, PHY_IDENTIFIER_1_REG, &phy_identifier);

12.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr, PHY_IDENTIFIER_2_REG, &phy_model);

13. 
    

14. /* Depending upon what manufacturer PHY is connected, a different mask is

15. * needed to determine the specific model number of the PHY. */

16.     if (phy_identifier == MARVEL_PHY_IDENTIFIER) {

17.         phy_model = phy_model & MARVEL_PHY_MODEL_NUM_MASK;

18. 
    

19.         if (phy_model == MARVEL_PHY_88E1116R_MODEL) {

20.             return get_phy_speed_88E1116R(xaxiemacp, phy_addr);

21.         } else if (phy_model == MARVEL_PHY_88E1111_MODEL) {

22.             return get_phy_speed_88E1111(xaxiemacp, phy_addr);

23.         }

24.     }

25.     else if (phy_identifier == TI_PHY_IDENTIFIER) {

26.         phy_model = phy_model & TI_PHY_DP83867_MODEL;

27.         phytype = XAxiEthernet_GetPhysicalInterface(xaxiemacp);

28. 
    

29.         if (phy_model == TI_PHY_DP83867_MODEL && phytype == XAE_PHY_TYPE_SGMII) {

30.             return get_phy_speed_TI_DP83867_SGMII(xaxiemacp, phy_addr);

31.         }

32. 
    

33.         if (phy_model == TI_PHY_DP83867_MODEL) {

34.             return get_phy_speed_TI_DP83867(xaxiemacp, phy_addr);

35.         }

36.     }

37.     else if(phy_identifier == PHY_YT8531_IDENTIFIER)

38.     {

39.         return get_YT8531_phy_speed(xaxiemacp, phy_addr);

40. 
    

41.     }

42.     else if(phy_identifier == PHY_REALTEK_IDENTIFIER)

43.     {

44.         return get_Realtek_phy_speed(xaxiemacp, phy_addr);

45.     }

46.     else {

47.         LWIP_DEBUGF(NETIF_DEBUG, ("XAxiEthernet get_IEEE_phy_speed: Detected PHY with unknown identifier/model.\r\n"));

48.     }

49. #endif

50. #ifdef PCM_PMA_CORE_PRESENT

51.     return get_phy_negotiated_speed(xaxiemacp, phy_addr);

52. #endif

53. }

第三个修改位置：

该代码需要复制xemacpsif_physpeed.c代码中已经有的get_Realtek_phy_speed函数，修改为，get_YT8531_phy_speed函数，并且基于AXI接口读取寄存器的函数进行修改，最后对读取的速率寄存器部分修改，读取的值含义对照YT8531芯片手册进行速率部分转换为1000/100/10三种速度

1. static u32_t get_YT8531_phy_speed(XAxiEthernet *xaxiemacp, u32_t phy_addr)

2. {

3.     u16_t control;

4.     u16_t status;

5.     u16_t status_speed;

6.     u32_t timeout_counter = 0;

7.     u32_t temp_speed;

8. 
   

9.     xil_printf("Start YT8531 PHY autonegotiation \r\n");

10. 
    

11.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, &control);

12.     control |= IEEE_ASYMMETRIC_PAUSE_MASK;

13.     control |= IEEE_PAUSE_MASK;

14.     control |= ADVERTISE_100;

15.     control |= ADVERTISE_10;

16.     XAxiEthernet_PhyWrite(xaxiemacp, phy_addr, IEEE_AUTONEGO_ADVERTISE_REG, control);

17. 
    

18.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,

19.                     &control);

20.     control |= ADVERTISE_1000;

21.     XAxiEthernet_PhyWrite(xaxiemacp, phy_addr, IEEE_1000_ADVERTISE_REG_OFFSET,

22.                     control);

23. 
    

24.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);

25.     control |= IEEE_CTRL_AUTONEGOTIATE_ENABLE;

26.     control |= IEEE_STAT_AUTONEGOTIATE_RESTART;

27.     XAxiEthernet_PhyWrite(xaxiemacp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);

28. 
    

29.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);

30.     control |= IEEE_CTRL_RESET_MASK;

31.     XAxiEthernet_PhyWrite(xaxiemacp, phy_addr, IEEE_CONTROL_REG_OFFSET, control);

32. 
    

33.     while (1) {

34.         XAxiEthernet_PhyRead(xaxiemacp, phy_addr, IEEE_CONTROL_REG_OFFSET, &control);

35.         if (control & IEEE_CTRL_RESET_MASK)

36.             continue;

37.         else

38.             break;

39.     }

40. 
    

41.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);

42. 
    

43.     xil_printf("Waiting for PHY to complete autonegotiation.\r\n");

44. 
    

45.     while ( !(status & IEEE_STAT_AUTONEGOTIATE_COMPLETE) ) {

46.         sleep(1);

47.         timeout_counter++;

48. 
    

49.         if (timeout_counter == 30) {

50.             xil_printf("Auto negotiation error \r\n");

51.             return XST_FAILURE;

52.         }

53.         XAxiEthernet_PhyRead(xaxiemacp, phy_addr, IEEE_STATUS_REG_OFFSET, &status);

54.     }

55.     xil_printf("autonegotiation complete \r\n");

56. 
    

57.     XAxiEthernet_PhyRead(xaxiemacp, phy_addr,0X11,&status_speed);

58.     status_speed = status_speed>>8;

59. 
    

60.     if (status_speed & 0x04) {

61.         temp_speed = status_speed & 0xc0;

62. 
    

63.         if (temp_speed == 0x80)

64.             return 1000;

65.         else if(temp_speed == 0x40)

66.             return 100;

67.         else

68.             return 10;

69. 
    

70.     }

71. 
    

72.     return XST_FAILURE;

73. }

文章来源：米联客