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| openpowerbot_ | [mattermost] <lkcl> mmor.. eevnin Paul. quick question: what bit can be set when an exception (0x400) occurs to stop icache.vhdl from leaving fetch_failed permanently high? | 12:50 |
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| openpowerbot_ | [mattermost] <lkcl> fetch_failed is a latched register that, on *successful* completion of the MMU-PTE-lookup with itlb done, i see it drops automatically when the instruction fetch is retried | 12:51 |
| openpowerbot_ | [mattermost] <lkcl> but what about when that PTE lookup *fails*? | 12:52 |
| openpowerbot_ | [mattermost] <lkcl> yes, first unit test i wrote, of course it tries to execute memory at 0x00000000 in PR=1 mode, so the MMU lookup throws an invalid exception, which raises a 0x400 exception... | 12:53 |
| openpowerbot_ | [mattermost] <lkcl> but fetch_failed is still raised HI even when executing the TRAP operation. and only stays HI when i pull a full system reset for the next unit test :) | 12:53 |
| openpowerbot_ | [mattermost] <lkcl> so i'm wondering which signal in icache.vldi fetch-in to pull to get it to calm down on the attention-grabbing :) | 12:54 |
| openpowerbot_ | [mattermost] <lkcl> found something that looks like what i need: icache.flush_in | 18:10 |
| openpowerbot_ | [mattermost] <lkcl> but... that appears to be tied to... writeback.vhdl? ehn? :) | 18:14 |
| openpowerbot_ | [mattermost] <lkcl> ahh which is tied to redirect | 18:15 |
| openpowerbot_ | [mattermost] <lkcl> which in turn is tied to interrupts | 18:15 |
| openpowerbot_ | [mattermost] <lkcl> which include exceptions | 18:15 |
| openpowerbot_ | [mattermost] <lkcl> which is indeed exactly what i want :) | 18:15 |
| openpowerbot_ | [slack] <Paul Mackerras> right 🙂 | 21:27 |
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