我已经将带有SPI接口的ENC28J60模块连接到运行Linux 3.8的Beaglebone Black开发板，但我无法将设备送到TX（或RX）。每次TX尝试超时并增加TX错误。
最初，Linux内核附带的驱动程序不允许我启动链接。经过一系列的调试后，我发现如果我在电路板初始化期间等了一段时间，我可以获得链接。驱动程序的补丁位于enc28j60_check_link_status函数中，并且或多或少如下。
unsigned long timeout = jiffies + 1*HZ;
while ((enc28j60_phy_read(priv, PHSTAT2) & PHSTAT2_LSTAT) == 0) {
if (time_after(jiffies, timeout)) {
if (netif_msg_drv(priv))
break;
}
schedule();
}
现在，我可以可靠地加载驱动程序并像这样配置接口。
ifconfig rename3 down
ethtool -s rename3 msglvl 0xffff
ethtool -s rename3 speed 10 duplex full
ifconfig rename3 up
我已经定制了ENC28J60的驱动程序来做一堆额外的printk，而我一直在寻找问题的根源。在启动界面后我得到以下内容。
Feb 1 00:22:48 arm kernel: [ 100.001942] enc28j60: HELLO WORLD
Feb 1 00:22:48 arm kernel: [ 100.002092] enc28j60: enc28j60_net_open() enter
Feb 1 00:22:48 arm kernel: [ 100.002119] enc28j60: enc28j60_hw_disable() enter
Feb 1 00:22:48 arm kernel: [ 100.002315] enc28j60: enc28j60_hw_init() enter
Feb 1 00:22:48 arm kernel: [ 100.002342] enc28j60: enc28j60_hw_init() - FullDuplex
Feb 1 00:22:48 arm kernel: [ 100.002366] enc28j60: enc28j60_soft_reset() enter
Feb 1 00:22:48 arm kernel: [ 100.006957] enc28j60: nolock_rxfifo_init() enter
Feb 1 00:22:48 arm kernel: [ 100.007117] enc28j60: erxrdpt_workaround() enter
Feb 1 00:22:48 arm kernel: [ 100.007373] enc28j60: nolock_txfifo_init() enter
Feb 1 00:22:48 arm kernel: [ 100.007807] enc28j60: chip RevID: 0x06
Feb 1 00:22:48 arm kernel: [ 100.009680] enc28j60: enc28j60_phy_write() enter
Feb 1 00:22:48 arm kernel: [ 100.010950] enc28j60: enc28j60_phy_write() enter
Feb 1 00:22:48 arm kernel: [ 100.011335] enc28j60: enc28j60_phy_write() enter
Feb 1 00:22:48 arm kernel: [ 100.014973] enc28j60 Hw initialized.
Feb 1 00:22:48 arm kernel: [ 100.014973] HwRevID: 0x06
Feb 1 00:22:48 arm kernel: [ 100.014973] Cntrl: ECON1 ECON2 ESTAT EIR EIE
Feb 1 00:22:48 arm kernel: [ 100.014973] 0x03 0x80 0x01 0x00 0x00
Feb 1 00:22:48 arm kernel: [ 100.014973] MAC : MACON1 MACON3 MACON4
Feb 1 00:22:48 arm kernel: [ 100.014973] 0x0d 0x33 0x00
Feb 1 00:22:48 arm kernel: [ 100.014973] Rx : ERXST ERXND ERXWRPT ERXRDPT ERXFCON EPKTCNT MAMXFL
Feb 1 00:22:48 arm kernel: [ 100.014973] 0x0000 0x19ff 0x0000 0x19ff 0xa1 0x00 0x05ee
Feb 1 00:22:48 arm kernel: [ 100.014973] Tx : ETXST ETXND MACLCON1 MACLCON2 MAPHSUP
Feb 1 00:22:48 arm kernel: [ 100.014973] 0x1a00 0x1fff 0x0f 0x37 0x10
Feb 1 00:22:48 arm kernel: [ 100.015073] enc28j60: enc28j60_set_hw_macaddr() enter
Feb 1 00:22:48 arm kernel: [ 100.015105] enc28j60: rename3: Setting MAC address to ee:31:66:60:5a:52
Feb 1 00:22:48 arm kernel: [ 100.015530] enc28j60: enc28j60_hw_enable() enter
Feb 1 00:22:48 arm kernel: [ 100.015556] enc28j60: enc28j60_hw_enable() enabling interrupts.
Feb 1 00:22:48 arm kernel: [ 100.015578] enc28j60: enc28j60_phy_write() enter
Feb 1 00:22:48 arm kernel: [ 100.017800] enc28j60: enc28j60_check_link_status() enter
Feb 1 00:22:48 arm kernel: [ 100.020726] enc28j60: enc28j60_check_link_status() PHSTAT1: 1800, PHSTAT2: 0200
Feb 1 00:22:48 arm kernel: [ 100.020760] enc28j60:enc28j60_check_link_status() polling PHSTAT2_LSTAT != 0
Feb 1 00:22:48 arm kernel: [ 100.069286] enc28j60:enc28j60_check_link_status() reg/link now 1536/1024
Feb 1 00:22:48 arm kernel: [ 100.069319] enc28j60:enc28j60_check_link_status() have link! setting carrier on
Feb 1 00:22:48 arm kernel: [ 100.069362] net rename3: link up - Full duplex
Feb 1 00:22:58 arm kernel: [ 109.989281] enc28j60: enc28j60_send_packet() enter
Feb 1 00:22:58 arm kernel: [ 109.989329] enc28j60: enc28j60_send_packet() enter
Feb 1 00:22:58 arm kernel: [ 109.989411] enc28j60: enc28j60_tx_work_handler() enter
Feb 1 00:22:58 arm kernel: [ 109.989437] enc28j60: enc28j60_hw_tx() enter
Feb 1 00:22:58 arm kernel: [ 109.989459] enc28j60: Tx Packet Len:70
Feb 1 00:22:58 arm kernel: [ 109.989481] enc28j60: enc28j60_hw_tx - packet len:70
Feb 1 00:22:58 arm kernel: [ 109.989517] pk data: 00000000: 33 33 00 00 00 02 ee 31 66 60 5a 52 86 dd 60 00 33.....1f`ZR..`.
Feb 1 00:22:58 arm kernel: [ 109.989548] pk data: 00000010: 00 00 00 10 3a ff fe 80 00 00 00 00 00 00 ec 31 ....:..........1
Feb 1 00:22:58 arm kernel: [ 109.989576] pk data: 00000020: 66 ff fe 60 5a 52 ff 02 00 00 00 00 00 00 00 00 f..`ZR..........
Feb 1 00:22:58 arm kernel: [ 109.989605] pk data: 00000030: 00 00 00 00 00 02 85 00 21 65 00 00 00 00 01 01 ........!e......
Feb 1 00:22:58 arm kernel: [ 109.989633] pk data: 00000040: ee 31 66 60 5a 52 .1f`ZR
Feb 1 00:22:58 arm kernel: [ 109.989655] enc28j60: enc28j60_packet_write() enter
Feb 1 00:22:58 arm kernel: [ 109.990379] enc28j60: enc28j60_packet_write() after control byte ERWPT:0x1a01
Feb 1 00:22:58 arm kernel: [ 109.990406] enc28j60: spi_write_buf() enter
Feb 1 00:22:58 arm kernel: [ 109.990571] enc28j60: enc28j60_packet_write() spi_write returns 0
Feb 1 00:22:58 arm kernel: [ 109.990761] enc28j60: enc28j60_packet_write() after write packet ERWPT:0x1a47, len=70
Feb 1 00:23:18 arm kernel: [ 129.979247] enc28j60: enc28j60_tx_timeout() enter
Feb 1 00:23:18 arm kernel: [ 129.979313] net rename3: enc28j60 tx timeout
我已使用其他打印语句将其缩小到spi_sync中对spi_read_buf的调用。知道Linux网络驱动程序或Microchip的ENC28J60的人是否知道我应该考虑解决这个问题？