RetailOS boot fixes - #47
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Judging by the register position and usage from RetailOS (only read accesses), it could likely be DMA status.
+0x028 bits 3-5 were erroneously identified as 'write 1 to clear IRQ'. Bit 5 is seemingly 'interrupt enable' (see ipodloader2 pp5020_unmask_irq and pp5002_mask_ack_irq bodies in interrupts.c). Bit 4 is used for masking interrupts. Bit 3 is probably interrupt status like bit 4. This modification fixes the "hda: lost interrupt" in iPodLinux.
Bit 30 ('HI_IRQ' in rockbox sources) is a bit aggregating interrupt
status from lower priority/speed peripherals (serial, GPIO, I2C, etc.).
Seems to make RetailOS happy.
The 'opto' peripheral is normally issuing automatic requests to the clickwheel controller IC (MCU?). The 'explicit command' (made-up name) register lets you issue manual commands to the controller, I assume for initialization purpose.
- Fixes burst of interrupts when the interrupter task is not polled for a while - Remove unneeded await
These registers aren't meaningful on an emulated drive but they are nonetheless accessed by RetailOS so they need to be emulated.
- Set DRDY to true (7.15.6.2) - Set DRQ to false (7.15.6.4) - Fix error register to use ABRT bit instead of MED (8.1.6)
Used in iPodLinux
Introduce internal method 'assert_intrq' which checks for interrupt enable configuration bit (nein). Fixes some interrupt issues.
Using Window.get_keys_pressed results in buggy key release detection. This commit uses instead Window.is_key_down, and detects changes on this value.
Lists all the peripherals reset during system reset
Used during RetailOS boot and in diagnostics (e.g. to enter disk mode the firmware leaves a magic value in IRAM then resets the whole system).
jeanthom
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Lots of emulation fixes that finally lets us enter RetailOS. Diagnostics and iPodLinux emulation is also improved (no more "Lost interrupt").