Unable to get write_io_u16 (or other write_ functions) to trigger - what could I be doing wrong?

[martin-hughes]

If I execute MAIN in the following ASL file, should I expect to see write_io_u16 called on my Handler? (spoiler alert: it isn't called.)

DefinitionBlock("basic_field.aml", "DSDT", 1, "RSACPI", "BASFLD", 1) {
    OperationRegion(MEM, SystemIO, 0x40, 0x50)
    Field(MEM, WordAcc, NoLock, Preserve) {
        A, 7,
        B, 8
    }

    Method(MAIN, 0, NotSerialized) {
        A = 4
        B = A

        Return (0)
    }
}

If I run it using acpiexec I can see the ACPICA equivalent being called, setting an appropriate value in B. If I use aml_tester I do not see anything being written to the IO space. (I do see several reads though) Instead do_store always seems to be storing the result in an Integer object. I haven't yet managed to dive deep enough to see where that object comes from.

The same question applies if I swap SystemIO to the SystemMemory space - I don't see any writes to there either.

This could all be something silly that I've done, which is why I've started here and not in the issues - anything spring to mind?

[martin-hughes]

Should say, this is using the latest commit right now: b69301e

[martin-hughes]

I'm pretty sure this is a bug, so I'm going to open an issue. If the issue turns out to be valid, I'll close this discussion

[martin-hughes]

No need to open an issue, looks exactly like #262 to me.