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The Linux kernel configuration item CONFIG_MIPS_CDMM
:
CONFIG_CPU_MIPSR2 || CONFIG_CPU_MIPSR5
Driver needed for the MIPS Common Device Memory Map bus in MIPS cores. This bus is for per-CPU tightly coupled devices such as the Fast Debug Channel (FDC).
For this to work, either your bootloader needs to enable the CDMM region at an unused physical address on the boot CPU, or else your platform code needs to implement mips_cdmm_phys_base() (see asm/cdmm.h).
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