[FS#1496] can not enable /dev/mem by "make kernel_menuconfig"

[LEDE Bugs]

The following task has a new comment added:

FS#1496 - can not enable /dev/mem by "make kernel_menuconfig"
User who did this - Qin Wei (Vonger)

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ah ,solved :) it is hidden so deep.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=1496#comment4593