am335x pru Soft-UART 硬件设备初始化问题

你给的链接中，不是已经告诉了在其他的文件中需要改什么东西了吗？因为是使用的mcasp模块，board-am335xevm.c中应该是需要初始化mcasp对应的管脚信息的。

那网页哪里没有讲到board-am335xevm.c里面该如何配置吧，还有我加载完驱动模块后，提示如下：

/lib/modules # insmod suart_emu.ko

[   26.507110] am33xx_pruss_uart am33xx_pruss_uart.1: no clock available: mcasp0_ick

不知这是什么原因呢？

加载内核后卡在了ti_am335x_pru_suart.c这里：

#ifdef CONFIG_AM33XX_SUART_MCASP0    

 clk_mcasp0_ick = clk_get(NULL, "mcasp0_ick");   

  if (IS_ERR(clk_mcasp0_ick)) {        

 dev_err(&pdev->dev, "no clock available: mcasp0_ick\n");  

       err = -ENODEV;         goto probe_exit_clk_mcasp0_1;     }

    soft_uart->clk_mcasp = clk_get(NULL, "mcasp0_fck");  

   if (IS_ERR(soft_uart->clk_mcasp)) {  

       dev_err(&pdev->dev, "no clock available: mcasp\n");

        err = PTR_ERR(soft_uart->clk_mcasp);

        soft_uart->clk_mcasp = NULL;

       //  goto probe_exit_clk_mcasp0_2;     }

    soft_uart->clk_freq_mcasp = clk_get_rate(clk_mcasp0_ick);  

   clk_enable(soft_uart->clk_mcasp);

 #endif

#ifdef CONFIG_AM33XX_SUART_MCASP1    

 clk_mcasp1_ick = clk_get(NULL, "mcasp1_ick");    

 if (IS_ERR(clk_mcasp1_ick)) {        

 dev_err(&pdev->dev, "no clock available: mcasp1_ick\n");

         err = -ENODEV;

       //  goto probe_exit_clk_mcasp1_1;     }

    soft_uart->clk_mcasp1 = clk_get(NULL, "mcasp1_fck");

    if (IS_ERR(soft_uart->clk_mcasp1))

 {         dev_err(&pdev->dev, "no clock available: mcasp1\n");

 .....

打印信息：

 # ismod suart_emu.ko

 [  631.034484] am33xx_pruss_uart am33xx_pruss_uart.1: no clock available: mcasp0_ick

 [  631.042846] am33xx_pruss_uart am33xx_pruss_uart.1: no clock available: mcasp

[  631.050537] am33xx_pruss_uart am33xx_pruss_uart.1: no clock available: mcasp1

搞了好多天了，望给点建议，谢谢。

是在没办法，最后选用了那网页里面的内核，但移植后还是出错了：

/ # insmod suart_emu.ko

 [  143.640045] am33xx_pruss_uart am33xx_pruss_uart.1: fw size 3912. downloading..

. [  143.647796] Configuring McASP0

 [  143.660064] ENABLING PRU0

 [  143.671783] ENABLING PRU1

[  143.674560] PROGRAM ID PRU0

 [  143.677673] pru_set_ram_data_for, uart_num : 3 pru_num:0 mcasp_num:1 tx_ser:1 rx_ser:0

 [  143.686035] Unable to handle kernel NULL pointer dereference at virtual address 00000184

[  143.694580] pgd = cfbd4000

[  143.697418] [00000184] *pgd=8fab3831, *pte=00000000, *ppte=00000000

 [  143.704101] Internal error: Oops: 817 [#1]

 [  143.708404] Modules linked in: suart_emu(+)

 [  143.712829] CPU: 0    Not tainted  (3.2.0-g41117e1-dirty #7)

 [  143.718811] PC is at pru_set_ram_data_for+0x274/0x2a4 [suart_emu]

[  143.725250] LR is at console_unlock+0x170/0x1f8 [  143.730010] pc : [<bf0002ec>]    lr : [<c003d4b4>]    psr: 60000013

[  143.730010] sp : cf98dc58  ip : cf98db50  fp : cf98dcc4 [  143.742095] r10: 4803c204  r9 : bf003bd4  r8 : 00000000

 [  143.747589] r7 : 4803c280  r6 : 4803c180  r5 : d0a80000  r4 : bf003b7cSegmentation fault

望解答，谢谢！

串口设备节点终于出来了，但这里的ttyS0 、1、2、3分别对应的硬件引脚是哪个呢？如果要改，在哪里改呢？谢谢！

/ # insmod suart_emu.ko

[   68.428436] am33xx_pruss_uart am33xx_pruss_uart.1: fw size 3912. downloading...

 [   68.436187] Configuring McASP0

 [   68.439453] Configuring McASP1

 [   68.451629] ENABLING PRU0

[   68.463409] ENABLING PRU1

 [   68.466186] PROGRAM ID PRU0

 [   68.469146] pru_set_ram_data_for, uart_num : 3 pru_num:0 mcasp_num:1 tx_ser:1 rx_ser:0

 [   68.477478] PROGRAM ID PRU1

 [   68.480407] pru_set_ram_data_for, uart_num : 1 pru_num:1 mcasp_num:0 tx_ser:2 rx_ser:0

 [   68.488769] pru_set_ram_data_for, uart_num : 2 pru_num:1 mcasp_num:0 tx_ser:3 rx_ser:1

 [   68.497100] RUN PRU0 [   68.499420] RUN PRU1

 [   68.501739] am33xx_pruss_uart.1: ttySU0 at MMIO 0x4a310000 (irq = 24) is a suart_tty

[   68.513885] am33xx_pruss_uart.1: ttySU1 at MMIO 0x4a310000 (irq = 25) is a suart_tty

 [   68.522827] am33xx_pruss_uart.1: ttySU2 at MMIO 0x4a310000 (irq = 20) is a suart_tty

 [   68.534210] am33xx_pruss_uart.1: ttySU3 at MMIO 0x4a310000 (irq = 21) is a suart_tty

 [   68.543029] am33xx_pruss_uart am33xx_pruss_uart.1: am33xx_pruss_uart device registered(pru_clk=192000000, asp_clk=100000000)