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* Implement JTAG BYPASS register.
This allows spike to put into a virtual scan chain with other
remote_bitbang JTAG devices.
* Initialize bypass to 0.
Also change what we do on what edge. In theory that's more correct but
in practice it doesn't make a difference.
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* Make minimum RTI behavior more realistic.
Now DMI will return busy when you'd expect it to, instead of a few scans
later. This only matters when testing OpenOCD. There is no other reason
to use --dmi-rti.
* dmireset only resets busy.
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Optionally make spike behave more like real hardware, to automatically
test OpenOCD's handling of such hardware.
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Off by default, enabled with --debug-auth.
The protocol is very simple (definitely not secure) to allow debuggers
to test their authentication feature. To authenticate a debugger must:
1. Read authdata
2. Write to authdata the value that it just read, plus 1
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OpenOCD actually checks this initial value now, and there's no reason
for it to indicate error.
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It's still pitiful, but less so. (5KB/s download speed.)
The tweaks involve switching to the other context as soon as it might be
helpful. The two contexts are executing code, and handling JTAG TAP
input.
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Now passing MemTest{8,16,32,64}
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Fails with not supported for 128-bit.
Fails with exception (on rv32) with 64-bit.
Succeeds (on rv32) with 32-bit.
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