Question

我想在Linux引导上引导远程处理器，或者将其与内核设备驱动程序一起引导。

我有一个带TI AM355x SoC的BeagleBone Black，它具有在Debian 9.5 IoT armhf 2018-10-17内核上运行4.14-ti的主处理器和两个通过remoteproc可用的PRU处理器。 Remoteproc是活动的，并且PRU在sysfs中/sys/class/remoteproc/remoteproc{1/2}/下可用。我可以使用上述界面成功启动PRU。

我尝试过：

设置一个rc.d脚本来启动处理器，但是似乎在执行它们时不可用。
使用DTB中定义的模型通过struct rproc中的struct rproc *rproc_get_by_phandle(phandle)接口在我的内核模块中获取一个linux/remoteproc.h句柄。句柄是这样的：0x3代表PRUSS，0x8代表pru0，0x9代表pru1。这些都不起作用。其实，我认为没有人能使用此功能。

我尝试了insmod，并添加了要在启动时加载的模块到/lib/modules/$(uname -r)，并在/etc/modules中添加了一个条目。这两个版本都无法检索该结构。

我可以看到来自4.14-ti内核的linux头文件包含一个带有linux/pruss.h函数的pruss_get文件，但是它使用一个struct rproc作为参数，因此使我无法使用它。

rc.d脚本

#!/bin/bash

### BEGIN INIT INFO
# Provides:          config_pru
# Required-Start:    kmod
# Required-Stop:
# Default-Start:
# Default-Stop:
# Short-Description: Configure pins and launch pru
# Description:       
### END INIT INFO

config-pin P8_11 pruout
config-pin P8_15 pruin
config-pin P8_12 pruout
config-pin P8_16 pruin
echo am335x-pru0-fw > /sys/class/remoteproc/remoteproc1/firmware
echo start > /sys/class/remoteproc/remoteproc1/state

模块文件片段

static struct rproc *pru0_rproc;

(...)

static int get_pru0_rproc(void)
{
    pru0_rproc = rproc_get_by_phandle(0x3); // Both 0x8 0x9 doesn't work
    printk(KERN_INFO "rproc_get_by_phandle: trying 0x3");
    return -(pru0_rproc == NULL);
}

static int __init prusw_init(void)
{
    (...)
    if (get_pru0_rproc())
    {
        printk(KERN_INFO "prusw: Failed to retrieve PRU0 rproc handle");
        goto deinit_rproc;
    }
    (...)
}

反编译的DTB

/dts-v1/;

/ {
compatible = "ti,beaglebone", "ti,beaglebone-black", "ti,beaglebone-green";
part-number = "AM335X-PRU-RPROC-4-14-TI";
version = "00A0";

fragment@0 {
    target-path = [2f 00];

    __overlay__ {

        ocp {
            #address-cells = <0x1>;
            #size-cells = <0x1>;

            pruss_soc_bus@4a326004 {
                compatible = "ti,am3356-pruss-soc-bus";
                reg = <0x4a326004 0x4>;
                ti,hwmods = "pruss";
                #address-cells = <0x1>;
                #size-cells = <0x1>;
                ranges = <0x0 0x4a3000
                status = "okay";
                 linux,phandle = <0x2>;
                 phandle = <0x2>;

                 pruss@0 {
                    compatible = "ti,am3356-pruss";
                    reg = <0x0 0x80000>;
                    interrupts = <0x14 0x15 0x16 0x17 0x18 0x19 0x1a 0x1b>;
                    interrupt-names = "host2", "host3", "host4", "host5", "hh
                ost6", "host7", "host8", "host9";
                    #address-cells = <0x1>;
                    #size-cells = <0x1>;
                    ranges;
                    status = "okay";
                    linux,phandle = <0x3>;
                    phandle = <0x3>;

                    (...)

                    pru@34000 {
                        compatible = "ti,am3356-pru";
                        reg = <0x34000 0x2000 0x22000 0x400 0x22400 0x100>;
                        reg-names = "iram", "control", "debug";
                        firmware-name = "am335x-pru0-fw";
                        interrupt-parent = <0x1>;
                        interrupts = <0x10 0x11>;
                        interrupt-names = "vring", "kick";
                        linux,phandle = <0x8>;
                        phandle = <0x8>;
                    };

                    pru@38000 {
                        compatible = "ti,am3356-pru";
                        reg = <0x38000 0x2000 0x24000 0x400 0x24400 0x100>;
                        reg-names = "iram", "control", "debug";
                        firmware-name = "am335x-pru1-fw";
                        interrupt-parent = <0x1>;
                        interrupts = <0x12 0x13>;
                        interrupt-names = "vring", "kick";
                        linux,phandle = <0x9>;
                        phandle = <0x9>;
                    };

                    (...)

我无法以非手动方式启动任何PRU，我想在启动或内核驱动程序模块加载时自动执行。

在Linux引导或内核设备驱动程序init中引导remoteproc

0 个答案: