EDMA job list cannot reside in Attic RAM

[dansanderson]

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• Platform: MEGA65R6
• Core Commit: 3c10488
• ROM Release: 920412

Describe the bug
An EDMA job list stored in Attic RAM can be triggered, but it does not succeed. The existence of the megabyte DMA address register D704 implies that this should work.

See the test program source attached, in Acme syntax. The labels job_addr, src_addr, and dest_addr can be adjusted to try different combinations. The program installs an EDMA job to job_addr to copy four bytes from src_addr to dest_addr, sets the source data to AABBCCDD, sets the destination to FFFFFFFF, then executes the EDMA job with its four-byte address. The test is successful if after running the destination memory contains AABBCCDD.

job_addr	src_addr	dest_addr	Result
$00001600	$00001700	$00001800	Success
$00001600	$08701700	$00001800	Success
$00001600	$08701700	$08701800	Success
$08701600	$00001700	$00001800	Failure
$08701600	$08701700	$00001800	Failure
$08701600	$08701700	$08701800	Failure

testatticdma.asm.txt

[dansanderson]

Note that my test program takes the register order into account: bank, megabyte, hi, lo. I'm aware that setting bank also sets megabyte to zero. As far as I can tell, there is a separate issue running a DMA job list located at (for example) 8700000.