IMX6DL PCIE can not read mem space

sbuul — Tue, 31 Mar 2020 06:41:19 GMT

We use imx6dl as PCIE RC mode , the pmc-24dsi12 as EP side.

At x86 system , it diver OK. the same divers we used in imx6dl , but there have some problem:

The PCIE can link up , and read config is ok , the device ID is OK , and read BAR addr is OK.

but when use ioremap() to convert BAR addr as virtual addr , and use readl() to read the virtual addr , the result is always 0.

1、开机启动时pcie的信息

pci 0000:02:00.0: BAR 0: assigned [mem 0x01100000-0x011000ff]

pci 0000:02:00.0: BAR 1: assigned [io 0x1000-0x10ff]

pci 0000:02:00.0: BAR 2: assigned [mem 0x01100100-0x011001ff]

2、lspci命令查询

00:00.0 PCI bridge: Device 16c3:abcd (rev 01)

01:00.0 PCI bridge: Tundra Semiconductor Corp. Device 8111 (rev 02)

02:00.0 Signal processing controller: PLX Technology, Inc. PCI9080 32-bit; 33MHz PCI <-> IOBus Bridge (rev 03)

3、pcie 24dsi采集卡驱动的内存映射

BAR0: Reg 0x01100000, Map mem, Adrs 0x01100000, Size 256, vaddr 0xC0A41000, Access RO

BAR1: Reg 0x00001000, Map I/O, Adrs 0x00001000, Size 256, vaddr 0x1000, Access RO

BAR2: Reg 0x01100100, Map mem, Adrs 0x01100100, Size 256, vaddr 0xC0A49100, Access RW

4、驱动内存访问

Mem Mx u32: rx 00000000, M 0000000F, V 0000000C, tx 0000000C: va 0xC0A4106C

读取0xC0A4106C的值为00000000

读取调用函数readl()

Re: IMX6DL PCIE can not read mem space

sbuul — Fri, 03 Apr 2020 07:28:36 GMT

怎么没有人帮忙提点一下呀？

jimmychan — Tue, 07 Apr 2020 08:44:30 GMT

which version of bsp are you using?

sbuul — Tue, 07 Apr 2020 08:45:58 GMT

we use 4.9.88

jimmychan — Thu, 09 Apr 2020 15:27:07 GMT

could you try the newer version of BSP? (e.g. L4.14.98_2.3.0)

sbuul — Fri, 10 Apr 2020 03:13:53 GMT

now we use 4.1.15 , it's work fine!