MEGA65: HyperRAM: Very first control register read needs two reads

[sy2002]

When I use a freshly programmed FPGA (fresh HyperRAM controller), and then read the control registers, the value of the first read at the first control register is wrong:

Control Registers:     (Output should be: 0081, 000C, 00F6, 00FF)
00DE
000C
00F6
00FF

When I then restart the same test program (without reset/restart, etc., just run the test program again), then the values are all read correctly:

Control Registers:     (Output should be: 0081, 000C, 00F6, 00FF)
0081
000C
00F6
00FF

I did an experiment:

If I read the very first value of the very first control register two times instead of one time, then I am receiving the correct value, even if I did it directly after programming the FPGA.

[sy2002]

The operative work on this issue is done in the MEGA65 core repo:

https://github.com/MEGA65/mega65-core/issues/281