MIPS support for PIC32 and GPIOs

[Peter Lambrechtsen]

Hi

I am using this fork of qemu that has pic32 support in it.

https://github.com/sergev/qemu/

When I boot a firmware image I get these errors as I don’t think the gpios have been defined. 

/usr/local/qemu-mips/bin/qemu-system-mipsel -machine pic32mx7-max32 -nographic -serial file:serial1.log -serial file:serial2.log -bios boot.hex -kernel pfm.hex

QEMU 2.3.50 monitor - type 'help' for more information

(qemu) Board: chipKIT Max32

Processor: M4K

RAM size: 128 kbytes

Load file: 'boot.hex', 2344 bytes

Load file: 'pfm.hex', 287440 bytes

--- Read 1f800810: peripheral register not supported

--- Write 00000001 to 1f800008: peripheral register not supported

--- Write 00000001 to ???: readonly register

--- Read 1f800600: peripheral register not supported

--- Write 00000030 to 1f800600: peripheral register not supported

--- Write 00000030 to ???: readonly register

--- Write 0000ffff to 1f800620: peripheral register not supported

--- Write 0000ffff to ???: readonly register

--- Write 00000000 to 1f800610: peripheral register not supported

--- Write 00000000 to ???: readonly register

--- Read 1f800c00: peripheral register not supported

--- Write 00000070 to 1f800c00: peripheral register not supported

--- Write 00000070 to ???: readonly register

--- Write 0000003f to 1f800c20: peripheral register not supported

--- Write 0000003f to ???: readonly register

--- Write 00000000 to 1f800c10: peripheral register not supported

--- Write 00000000 to ???: readonly register

--- Read 1f800600: peripheral register not supported

--- Write 00008000 to 1f800600: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f800c00: peripheral register not supported

--- Write 00008000 to 1f800c00: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Write 00000000 to 1f800800: peripheral register not supported

--- Write 00000000 to ???: readonly register

--- Write 00000000 to 1f800810: peripheral register not supported

--- Write 00000000 to ???: readonly register

--- Write 00000000 to 1f800a10: peripheral register not supported

--- Write 00000000 to ???: readonly register

--- Write 0000ffff to 1f800a20: peripheral register not supported

--- Write 0000ffff to ???: readonly register

--- Write 00000078 to 1f800800: peripheral register not supported

--- Write 00000078 to ???: readonly register

--- Write 00000000 to 1f800810: peripheral register not supported

--- Write 00000000 to ???: readonly register

--- Write ffffffff to 1f800820: peripheral register not supported

--- Write ffffffff to ???: readonly register

--- Write 00008000 to 1f800808: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f800810: peripheral register not supported

--- Write 1d07e000 to 1f80f420: peripheral register not supported

--- Write 1d07e000 to ???: readonly register

--- Write 00004004 to 1f80f400: peripheral register not supported

--- Write 00004004 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07e000 to 1f80f420: peripheral register not supported

--- Write 1d07e000 to ???: readonly register

--- Write 0000c608 to 1f80f440: peripheral register not supported

--- Write 0000c608 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07e200 to 1f80f420: peripheral register not supported

--- Write 1d07e200 to ???: readonly register

--- Write 0000c808 to 1f80f440: peripheral register not supported

--- Write 0000c808 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07e400 to 1f80f420: peripheral register not supported

--- Write 1d07e400 to ???: readonly register

--- Write 0000ca08 to 1f80f440: peripheral register not supported

--- Write 0000ca08 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07e600 to 1f80f420: peripheral register not supported

--- Write 1d07e600 to ???: readonly register

--- Write 0000cc08 to 1f80f440: peripheral register not supported

--- Write 0000cc08 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07e800 to 1f80f420: peripheral register not supported

--- Write 1d07e800 to ???: readonly register

--- Write 0000ce08 to 1f80f440: peripheral register not supported

--- Write 0000ce08 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07ea00 to 1f80f420: peripheral register not supported

--- Write 1d07ea00 to ???: readonly register

--- Write 0000d008 to 1f80f440: peripheral register not supported

--- Write 0000d008 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07ec00 to 1f80f420: peripheral register not supported

--- Write 1d07ec00 to ???: readonly register

--- Write 0000d208 to 1f80f440: peripheral register not supported

--- Write 0000d208 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 1d07ee00 to 1f80f420: peripheral register not supported

--- Write 1d07ee00 to ???: readonly register

--- Write 0000d408 to 1f80f440: peripheral register not supported

--- Write 0000d408 to ???: readonly register

--- Write 00004003 to 1f80f400: peripheral register not supported

--- Write 00004003 to ???: readonly register

--- Write aa996655 to 1f80f410: peripheral register not supported

--- Write aa996655 to ???: readonly register

--- Write 556699aa to 1f80f410: peripheral register not supported

--- Write 556699aa to ???: readonly register

--- Write 00008000 to 1f80f408: peripheral register not supported

--- Write 00008000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Write 00004000 to 1f80f404: peripheral register not supported

--- Write 00004000 to ???: readonly register

--- Read 1f80f400: peripheral register not supported

--- Read 1f800810: peripheral register not supported

I think I need to add a new case at this point to stub the gpios 

https://github.com/sergev/qemu/blob/a2e0277dfe4b399a074f2124c0326be31b34a6e8/hw/mips/mips_pic32mx7.c#L833

But have never had any experience with how qemu works or building up objects. 

Is there any pointers that could help me along this journey?

Cheers Peter