Port back changes from open_agb_firm. Now with proper screen init.

Cleanup some reg names in gfx.c.

Partially revert texture copy commit. It's not the same bug.

Use clz instead of log2().

Updated PXI code/doc with new findings.

Added full CODEC init and CSND implementation.

Fixed texture copy race.

A bit more codec stuff.

Hardware code cleanup + new documentaion/findings.

Use udf pseudo instruction to trap unused exception vectors.

Added proper GPIO driver.

Fixed gcc 9.1 altering the inline asm of the wait() function to an infinity loop.

Don't disable vfp (no harm in leaving it on). Lots of small, mostly style changes.

Update makefiles. Use .specs files for the linker.

A few MMU code fixes.

Added GPU reset code (unused because it works as is). Disabled tag RAM and L1 parity checking on ARM11. Don't rely on code overhead at SD card init for the 74 clock pulses. Implemented new cycle accurate delay function.

More code improvements/documentation.

Improved RSA code a bit. Now uses interrupts.

A few code optimizations.

Simplified MMU mappings a bit and added documentation which bits are which.

Updated SPI code. Added unused SPICARD code.

Fix for the HOME button workaround, other bugfixes and cleanup.

Fixed PXI bug introduced in previos PXI/IPC cleanup.

HID refactor.

Simplify CODEC code even more.

PXI, IPC and debug code cleanup.

Some PXI code cleanup.

[spiflash.c] Set offset directly instead of byte writes.

Minor fixes/adjustments to SPI code. Moved spiflash code to ARM11.

Added SPI and CODEC drivers. Unused right now.