TI中文支持网hi，我最近在弄有关pru虚拟串口的东西，按照这上面http://processors.wiki.ti.com/index.php/Soft-UART_Implementation_on_AM335X_PRU_-_Software_Users_Guide#Soft-UART_Configuration_Options 我把驱动移植到了我的内核里面，但现在对硬件设备管脚等的一些初始化不知怎么搞，我的设备接线如下图：
最左边是MCASP0_AXR0,MCASP0_AXR2(图左边没截全)。。。我在board-am335xevm.c里应该怎样初始化呢？
还有，drivers/serial/am335x_pru_suart/am335x_suart_board.h这个文件我需要修改为我对应的gpio管脚么？
望解答，谢谢。
Steven Liu1：
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。
Dendi：
回复 Steven Liu1:
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？
Dendi：
回复 Steven Liu1:
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。
Dendi：
回复 Steven Liu1:
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！
Dendi：
回复 Steven Liu1:
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)
Dendi：
回复 Dendi:
已解决！在内核源码的clock33xx_data.c的static struct omap_clk am33xx_clks[] 结构体中加入下面语句：
CLK(NULL, "mcasp0_ick", &mcasp0_ick, CK_AM33XX),
CLK(NULL, "mcasp0_fck", &mcasp0_fck, CK_AM33XX),
CLK(NULL, "mcasp1_ick", &mcasp1_ick, CK_AM33XX),
CLK(NULL, "mcasp1_fck", &mcasp1_fck, CK_AM33XX),
