[bus] Return error if decode fails #2142
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Return an error signal to the host if an address request does not match any device. Previously a decode failure would match against the first device, which in the Ibex Demo System happens to be the SRAM.
rswarbrick
approved these changes
Feb 15, 2024
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Return an error signal to the host if an address request does not match any device.
Previously a decode failure would match against the first device, and in the Ibex Demo System that happens to be the SRAM; any attempt to read/write to an invalid address - including dereferencing of NULL pointers - hits the SRAM.
From a software perspective it is much more helpful to receive an immediate exception report with MCAUSE/MTVAL.