Full FORMAT of D81 disk image hangs; DIR of full FORMATted internal floppy hangs

[dansanderson]

Test Environment (required)
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• Platform: MEGA65R6
• Core Commit: Release v0.96 3c10488
• ROM Release: Release v0.96 920395

Describe the bug
A full format of a D81 disk image using the FORMAT command with an ID stalls.

A full format of an internal floppy disk makes OK sounds and ends after an appropriate duration, but a DIR on the result stalls.

To Reproduce

1. Freezer, drive 0, create a new disk image. Resume.
2. DIR to confirm disk image is working.
3. FORMAT "NEWNAME",IXX

Expected: should finish within a minute.
Actual: Stalls in CBDOS code.

1. Insert an expendable 3-1/2" DD floppy disk in the internal drive.
2. MOUNT
3. FORMAT "NEWNAME",IXX
4. Format finishes.
5. DIR

Expected: displays directory of new empty disk.
Actual: Stalls.

Additional context
I have confirmed that I'm using v0.96 core and ROM. I need help confirming whether this is true of all R6 machines running v0.96 stable, and whether it also applies to R3. I was inspired to test because someone else also reported a stall in full formatting.

Quick formatting (without the I parameter) is working.

[dansanderson]

We have one report of no reproduction on an R3 board. It is unlikely that R3 and R6 will differ in this way, so I'm still looking for other causes.

I confirmed that a D81 disk image created with something other than the Freezer has the issue.

I can repro using both my external microSD card and my internal SD card.

[lgblgblgb]

I've tested my setup here, also hangs.

Board: R3, ARTIX version: B8756F4A according to HELP key in FREEZER (btw, I need a reset, since busy bit being stuck made not even freezer could load/come up)

ROM v920410 according to matrix monitor execution is somewhere around 97A1,97A3,979E and such values in general, if it helps. It's often at a place "BIT $D082" which is the FDC status register IIRC, so probably it waits for the operation to finish? Again, according to matrix monitor I/O reg D082 (FFD3082) has the value $A1 at that point, so bit 7 is set, indicating busy.

EDIT This is with D81. With the real drive, I don't encounter stalling, formatting is OK, also DIR after then is OK as well. My assumption: mega65-core (at least the version I have) does not cope too well with format FDC "command" when it's not a real drive but a D81 file, and it just keeping the buys bit "on" while ROM waits it to be ready. For sure, in case of a mounted D81, there is not even a low-level format unlike with real drive.