How to specify virtual Address for pl011 uart in linux kernel

Hi,

I am a beginner in kernel porting. I am trying to port Linux kernel (version- 4.9.22) on Custom SoC (cpu = arm1176jzfs based) for custom evaluation Board. I am having ARM Prime cell pl011 UART in my SoC. And it is physically mapped to 0x5800_1000 address. While i am trying to use it as Debug UART, kernel is asking for its virtual Address. How should i configure this option.

i.e:
    -> Kernel low-level debugging functions
        -> kernel low-level debugging port (Kernel low-level debugging on via ARM Ltd PL01x Primecell UART)
    (0x58001000) Physical base address of debug UART
    (??) Virtual base address of debug UART

Thanks,

Vivek T.

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  • 0

    If you have a debugger, then you can certainly debug why your kernel is not booting up.

    You can watch this steps: 9Apps VidMate.vin Apk9apps.com

    -In Kernel configuration, enable CONFIG_DEBUG_INFO (Kernel Hacking -> Compile-time checks and compiler options)

    -Compile the kernel

    -From the debugger software, load the symbols from the elf. The command varies from one debugger to another

    -Find symbol "log_buf", and chose option to "Display memory as dump"

    So I think the kernel logs stored in the buffer. Maybe it can help you :)

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  • 0

    If you have a debugger, then you can certainly debug why your kernel is not booting up.

    You can watch this steps: 9Apps VidMate.vin Apk9apps.com

    -In Kernel configuration, enable CONFIG_DEBUG_INFO (Kernel Hacking -> Compile-time checks and compiler options)

    -Compile the kernel

    -From the debugger software, load the symbols from the elf. The command varies from one debugger to another

    -Find symbol "log_buf", and chose option to "Display memory as dump"

    So I think the kernel logs stored in the buffer. Maybe it can help you :)

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