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CPU: MMR0 trap bit set when access aborted #26

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wfjm opened this issue Apr 5, 2019 · 0 comments
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CPU: MMR0 trap bit set when access aborted #26

wfjm opened this issue Apr 5, 2019 · 0 comments
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bug minor deficit non-conformity but minimal impact on operation

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wfjm commented Apr 5, 2019 •
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The MMU should set the 'trap bit' in MMR0 only when the access is not aborted. The current pdp11_mmu implementation sets the bit even when the access is aborted.

This is the reason why test 064 of the ekbee1 diagnostics currently fails.

Since the MMU trap mechanism is is only available on 11/45 and 11/70, but not in the J11, it is not used by common operating systems. Therefore this is considered a to be a minor deficit. Will be fixed in an upcoming release.

originally filed as issue w11a_V0.50-6 and TCK-030 dated 2009-05-09.
@wfjm wfjm added the minor deficit non-conformity but minimal impact on operation label Apr 5, 2019
@wfjm wfjm changed the title CPU: SSR0 trap bit set when access aborted CPU: MMR0 trap bit set when access aborted Aug 8, 2022
@wfjm wfjm self-assigned this Sep 5, 2022
@wfjm wfjm added the bug label Sep 5, 2022
@wfjm wfjm closed this as completed in 1644863 Sep 9, 2022
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