IMX8MM Cortex M4 m_data size issue

Dhevan — Thu, 10 Mar 2022 18:53:32 GMT

Hi,

I am using 5.4.24 kernel version.

DTS File:

reserved-memory { #address-cells = <2>; #size-cells = <2>; ranges; m4_reserved: m4@0x80000000 { no-map; reg = <0 0x80000000 0 0x1000000>; }; vdev0vring0: vdev0vring0@b8000000 { compatible = "shared-dma-pool"; reg = <0 0xb8000000 0 0x8000>; no-map; }; vdev0vring1: vdev0vring1@b8008000 { compatible = "shared-dma-pool"; reg = <0 0xb8008000 0 0x8000>; no-map; }; vdevbuffer: vdevbuffer@b8400000 { compatible = "shared-dma-pool"; reg = <0 0xb8400000 0 0x100000>; no-map; }; }; imx8mm-cm4 { compatible = "fsl,imx8mm-cm4"; rsc-da = <0xb8000000>; clocks = <&clk IMX8MM_CLK_M4_DIV>; mbox-names = "tx", "rx", "rxdb"; mboxes = <&mu 0 1 &mu 1 1 &mu 3 1>; memory-region = <&vdev0vring0>, <&vdev0vring1>, <&vdevbuffer>; syscon = <&src>; }; };

I want to allocate big buffer(ex 100kb) in m4 side.

When ever am trying compile the code am getting error as a m_data size exceed.

/usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: ddr_debug/rpmsg_lite_str_echo_rtos_imxcm4.elf section `.bss' will not fit in region `m_data' /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: region m_data overflowed with stack and heap /usr/lib/gcc/arm-none-eabi/6.3.1/../../../arm-none-eabi/bin/ld: region `m_data' overflowed by 2699576 bytes collect2: error: ld returned 1 exit status CMakeFiles/rpmsg_lite_str_echo_rtos_imxcm4.elf.dir/build.make:1074: recipe for target 'ddr_debug/rpmsg_lite_str_echo_rtos_imxcm4.elf' failed make[2]: *** [ddr_debug/rpmsg_lite_str_echo_rtos_imxcm4.elf] Error 1 CMakeFiles/Makefile2:67: recipe for target 'CMakeFiles/rpmsg_lite_str_echo_rtos_imxcm4.elf.dir/all' failed make[1]: *** [CMakeFiles/rpmsg_lite_str_echo_rtos_imxcm4.elf.dir/all] Error 2 Makefile:83: recipe for target 'all' failed make: *** [all] Error 2

I had tried both ddr_debug and tcm_debug am getting same error.

If possible to increase m_data size in ld file?

How to increase m_data size ?

Thanks & Regards,

Vasu

Re: IMX8MM Cortex M4 m_data size issue

AldoG — Thu, 28 Apr 2022 00:48:24 GMT

Hello,

If this is does still help, I think it may be better to run at DDR and not TCM if you have already exceeded the size.

You may increase m_data at liner file just make sure that you increase the reserved memory size in device tree as well.

Best regards,
Aldo.

i.MX Processors中的主题 IMX8MM Cortex M4 m_data size issue

IMX8MM Cortex M4 m_data size issue

Re: IMX8MM Cortex M4 m_data size issue