This register controls controls the hardware rights (access to various engines/interfaces) for both the PPC (Broadway) and IOP (Starlet/IOS). By default, only Starlet/IOS can write to this register. You are able to freely write to the unused bits. If a TMD has it's access right bit flipped high, syscall (0x54) is called from IOS and the register gets logically OR'd with the value of 0x80000DFE, thus giving PPC access to every engine/interface. Link - https://hackmii.com/2009/08/of-tmds-and-hardware/
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This register controls controls the hardware rights (access to various engines/interfaces) for both the PPC (Broadway) and IOP (Starlet/IOS). By default, only Starlet/IOS can write to this register. You are able to freely write to the unused bits. If a TMD has its access right bit flipped high, syscall (0x54) is called from IOS and the register gets logically OR'd with the value of 0x80000DFE, thus giving PPC access to every engine/interface. Link - https://hackmii.com/2009/08/of-tmds-and-hardware/