Hey people who know things about hardware glitching: if I want to fiddle with reset pc control would I want to mess with Vcc in addition to RESET or might RESET alone be sufficient? I have a setup that I could easily throw analog voltage at RESET with, but not Vcc.
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All the tests I've done to use ARM code on the 5V cartridges have failed. Even using a shin to prevent the GBA from rebooting into 5V mode yielded nothing but floating reads (and yes I used the SRAM range so signaling might actually work; the ROM range is a different protocol)
By floating reads you mean the usual open bus / prefetched instruction? Hmm. I wonder what a logic analyzer would say. Or if there might be some other address space range that can be used, or a magic bit somewhere.
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Nah, open bus is on the address bits, not the data bits. It just so happens that ROM addressing uses both as the address and the address bits as the data bits as compared to the GB version.
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Sorry, I wasn't clear. What values did you read? If it's an undecoded memory range I expect the prefetched ARM insns; if it's open GBA cart bus I expect incremeting addresses for ROM (due to the muxing), maybe junk for SRAM. I'm trying to guess how the mode switch is implemented.
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