Not on all architectures though. On PPC750CL, the CPU always reads whole cache lines from RAM first (at least with the settings used on the Wii), and Nintendo relied on this fact when they were too lazy to make the byte enables work in the PI<->MEM2 bridge.https://twitter.com/rygorous/status/1264418562845728768 …
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And this is the anti-emulator protection in the non-public version of wiipax (used for HBC). We do byte writes to uncached mappings and exploit the unexpected behavior of clobbering the whole 64bit word.
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