i.MX ProcessorsのトピックRe: How to remapped WEIM CS address space in Linux

How to remapped WEIM CS address space in Linux

hengyewlim — Mon, 15 Aug 2016 03:23:46 GMT

Hi,

I have a problem trying to remap WEIM CS physical address to virtual address in Linux 3.14.52.1.1.0.

I am using CS1 and split the WEIM address space to 32MB block each.

I tried using the IMX_IO_P2V(0x52000000) that remapped to 0xF9200000 and got a segmentation fault when trying to read it.

Do I need to setup the device tree in order to access this memory space.

I was able to access this memory space correctly in u-boot using the physical address.

HengYew

Re: How to remapped WEIM CS address space in Linux

igorpadykov — Mon, 15 Aug 2016 05:38:53 GMT

Hi Heng

eim remapping in device tree is described in linux/Docimentation/..imx-weim.txt

linux-2.6-imx.git - Freescale i.MX Linux Tree

example with weim usage can be found in imx6qdl-sabreauto.dtsi

linux-2.6-imx.git - Freescale i.MX Linux Tree

Best regards

igor

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Re: How to remapped WEIM CS address space in Linux

hengyewlim — Mon, 15 Aug 2016 09:31:46 GMT

Igor,

I managed to use of_iomap to remapped to virtual address but was thinking whether it can be done using #define IMX_IO_P2V because it will be called from different modules.

HengYew

Re: How to remapped WEIM CS address space in Linux

hengyewlim — Tue, 16 Aug 2016 03:18:41 GMT

I found a solution which is to add mapping the CS1 region in pm-imx6.c similar to CCM/Anatop region.