请教CH19 9V034视频采集 insmod axi_vdma错误

本帖最后由船长于 2019-10-7 07:48 编辑

我学习zynq的修炼秘籍linux篇的第19章时，根据教程的步骤操作完成后，加载驱动时发现如下问题，请问是什么原因：

root@stretch-armhf:/home/osrc/CH07_VDMA# insmod axi_vdma.ko
axi_vdma: loading out-of-tree module taints kernel.
axi vdma s2mm valid
axivdma 43010000.dma: registered.
axivdma 43010000.dma: axi vdma buffer memory allocation failed
axivdma: probe of 43010000.dma failed with error -12

我使用modprobe ,提示的信息如下：
modprobe: FATAL: Module axi_vdma.ko not found in directory /lib/modules/4.14.0-xilinx

我修改了SD 里面uEnv.txt文件，optargs=cam=128M.
CH18 framebuffer的教程我按照步骤操作没有问题，结果与教程一致。
我的开发vivado的版本是vivado 2019.1

根据上面的错误的信息“ buffer memory allocation failed”，我修改了axi_vdma.c申请的内存大小，由64M 修改为8M ，之后就没有问题了。
root@stretch-armhf:/home/osrc/CH07_VDMA# insmod axi_vdma.ko
axi_vdma: loading out-of-tree module taints kernel.
axi vdma s2mm valid
axivdma 43010000.dma: registered.
axivdma 43010000.dma: AXI VDMA Engine Driver Probed!!

我的boot里面的uENV.txt的内容为：
optargs=console=tty0 consoleblank=0 vt.global_cursor_default=0 cma=128M(我只添加cma也不行)

但是我看内核的启动信息的时候发现cma的参数好像没有传到kernel
Kernel command line: console=ttyPS0,115200 earlyprintk root=/dev/mmcblk0p2 rw rootfstype=ext4 rootwait

请问这个问题该如何解决？

uisrc · 发表于 2019-10-7 10:57:28

把uboot的设备树，和kernel的设备树关于内存部分的都贴上来

船长 · 发表于 2019-10-7 11:15:12

u-boot的设备数：
路径：osrc-lab/sources/u-boot/arch/arm/dts  ，文件zynq-mz7x.dts

21       memory@0 {
22                device_type = "memory";
23                reg = <0x0 0x20000000>;
24       };

======================================

内核：
路径：osrc-lab/boards/MZ7X/debian/dts  system-top.dts
29       memory@0 {
30                device_type = "memory";
31                reg = <0x0 0x40000000>;
32       };

zynq-7000.dts
161                mc: memory-controller@f8006000 {
162                      compatible = "xlnx,zynq-ddrc-a05";
163                      reg = <0xf8006000 0x1000>;
164                };

227                smcc: memory-controller@e000e000 {
228                      #address-cells = <1>;
229                      #size-cells = <1>;
230                      status = "disabled";
231                      clock-names = "memclk", "aclk";
232                      clocks = <&clkc 11>, <&clkc 44>;
233                      compatible = "arm,pl353-smc-r2p1";
234                      interrupt-parent = <&intc>;
235                      interrupts = <0 18 4>;
236                      ranges ;
237                      reg = <0xe000e000 0x1000>;
238                      nand0: flash@e1000000 {
239                               status = "disabled";
240                               compatible = "arm,pl353-nand-r2p1";
241                               reg = <0xe1000000 0x1000000>;
242                               #address-cells = <0x1>;
243                               #size-cells = <0x1>;
244                      };
245                      nor0: flash@e2000000 {
246                               status = "disabled";
247                               compatible = "cfi-flash";
248                               reg = <0xe2000000 0x2000000>;
249                               #address-cells = <1>;
250                               #size-cells = <1>;
251                      };
252                };

uisrc · 发表于 2019-10-7 11:26:50

21       memory@0 {
22                device_type = "memory";
23                reg = <0x0 0x20000000>;
24       };

这个地方内存大小是512MB 改成 reg = <0x0 0x40000000>;

船长 · 发表于 2019-10-7 12:22:55

修改了之后，Starting kernel 就在一直等待，启动信息如下：

U-Boot 2018.01 (Oct 07 2019 - 11:58:22 +0800)

Model: Zynq mz7x Development Board
Board: Xilinx Zynq
Silicon: v3.1
DRAM:  ECC disabled 1 GiB
MMC: sdhci_transfer_data: Error detected in status(0x208000)!
sdhci@e0100000: 0 (SD), sdhci@e0101000: 1 (eMMC)
SF: Detected n25q128 with page size 256 Bytes, erase size 64 KiB, total 16 MiB
In: serial@e0001000
Out: serial@e0001000
Err: serial@e0001000
Net: ZYNQ GEM: e000b000, phyaddr 0, interface rgmii-id
eth0: ethernet@e000b000
Hit any key to stop autoboot:  0
SDCARD Boot Mode
[INFO] Scanning mmc 0...
switch to partitions #0, OK
mmc0 is current device
reading uEnv.txt
63 bytes read in 12 ms (4.9 KiB/s)
Loaded environment from uEnv.txt
Importing environment from mmc 0...
[INFO] Trying to boot from mmc 0
reading uImage
4052264 bytes read in 263 ms (14.7 MiB/s)
reading devicetree.dtb
11389 bytes read in 18 ms (617.2 KiB/s)
** Unable to read file uramdisk.image.gz **
## Booting kernel from Legacy Image at 02080000 ...
Image Name: Linux-4.14.0-xilinx
Image Type: ARM Linux Kernel Image (uncompressed)
Data Size: 4052200 Bytes = 3.9 MiB
Load Address: 00008000
Entry Point:  00008000
Verifying Checksum ... OK
## Flattened Device Tree blob at 02000000
Booting using the fdt blob at 0x2000000
Loading Kernel Image ... OK
Loading Device Tree to 3eb14000, end 3eb19c7c ... OK

Starting kernel ...

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