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FS#1496 - can not enable /dev/mem by "make kernel_menuconfig" #6456

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openwrt-bot opened this issue Apr 15, 2018 · 3 comments
Closed

FS#1496 - can not enable /dev/mem by "make kernel_menuconfig" #6456

openwrt-bot opened this issue Apr 15, 2018 · 3 comments
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@openwrt-bot
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Vonger:

  • Device problem occurs on
    all ramips device, other device might effect too, but I can not test.

  • Software versions of OpenWrt/LEDE release, packages, etc.
    Truck, my test from Linux 4.9 to 4.14

  • Steps to reproduce
    make kernel_menuconfig, select Device Drivers -> Character devices -> /dev/mem virtual device support
    then make the firmware, upgrade to device, there is no file node /dev/mem.

If I directly hack the kernel, modify kernel/driver/char/mem.c, remove macro CONFIG_DEVMEM, /dev/mem will appear on firmware.
@openwrt-bot
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NeoRaider:

Did you try enabling CONFIG_KERNEL_DEVMEM in the OpenWrt toplevel .config? ("Global build settings" -> "Kernel build options" -> "/dev/mem virtual device support" in make menuconfig)? Settings in toplevel .config take precedence over kernel .config.

@openwrt-bot
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Vonger:

thank you for the info, I will try.

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Vonger:

ah ,solved :) it is hidden so deep.

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