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Jim Mussared d4190815a3 py/mpconfig: Disable qstr hashing at minimum feature level. 
This will apply to bare-arm and minimal, as well as the minimal unix
variant.

Change the default to MICROPY_QSTR_BYTES_IN_HASH=1 for the CORE,BASIC
levels, 2 for >=EXTRA.

Removes explicit setting of MICROPY_QSTR_BYTES_IN_HASH==1 in ports that
don't set the feature level (because 1 is implied by the default level,
CORE). Applies to cc3200, pic16bt, powerpc.

Removes explicit setting for nRF (which sets feature level). Also for samd,
which sets CORE for d21 and FULL for d51. This means that d21 is unchanged
with MICROPY_QSTR_BYTES_IN_HASH==1, but d51 now moves from 1 to 2 (roughly
adds 1kiB).

The only remaining port which explicitly set bytes-in-hash is rp2 because
it's high-flash (hence CORE level) but lowish-SRAM, so it's worthwhile
saving the RAM for runtime qstrs.

This work was funded through GitHub Sponsors.

Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
 		2024-01-25 16:38:17 +11:00
..
Makefile all: Use += rather than = everywhere for CFLAGS/LDFLAGS/LIBS. 2022-10-11 23:17:41 +11:00
README.md powerpc/uart: Choose which UART to use at build time, not runtime. 2020-05-29 22:54:55 +10:00
head.S all: Fix spelling mistakes based on codespell check. 2023-04-27 18:03:06 +10:00
main.c py/builtinevex: Handle invalid filenames for execfile. 2023-10-12 15:17:59 +11:00
mpconfigport.h py/mpconfig: Disable qstr hashing at minimum feature level. 2024-01-25 16:38:17 +11:00
mphalport.h all: Reformat C and Python source code with tools/codeformat.py. 2020-02-28 10:33:03 +11:00
powerpc.lds all: Fix spelling mistakes based on codespell check. 2023-04-27 18:03:06 +10:00
qstrdefsport.h all: Add *FORMAT-OFF* in various places. 2020-02-28 10:31:07 +11:00
uart_lpc_serial.c ports: Fix sys.stdout.buffer.write() return value. 2023-12-22 10:32:46 +11:00
uart_lpc_serial.h powerpc: Add initial port to bare metal PowerPC arch. 2019-10-22 22:45:33 +11:00
uart_potato.c ports: Fix sys.stdout.buffer.write() return value. 2023-12-22 10:32:46 +11:00
uart_potato.h powerpc: Add initial port to bare metal PowerPC arch. 2019-10-22 22:45:33 +11:00
unistd.h powerpc: Add initial port to bare metal PowerPC arch. 2019-10-22 22:45:33 +11:00

README.md

The PowerPC port that runs on microwatt and qemu

This port is intended to be a minimal MicroPython port that runs in QEMU, microwatt simulator with ghdl or microwatt on Xilinx FPGA with potato UART.

Building

By default the port will be built with the potato uart for microwatt:

$ make

To instead build for a machine with LPC serial, such as QEMU powernv:

$ make UART=lpc_serial

Cross compilation for POWERPC

If you need to cross compilers you'll want to grab a powerpc64le compiler (not powerpc or powerpc64).

On Ubuntu (18.04) you'll want:

$ apt install gcc-powerpc64le-linux-gnu

(Use CROSS_COMPILE=powerpc64le-linux-gnu-)

If your distro doesn't have cross compilers, you can get cross compilers here:

(Avoid musl libc as it defines __assert_fail() differently to glibc which breaks the micropython powerpc code)

Then do:

$ make CROSS_COMPILE=<compiler prefix>

Building will produce the build/firmware.bin file which can be used QEMU or microwatt.

To run in QEMU use:

$ ./qemu-system-ppc64 -M powernv -cpu POWER9 -nographic -bios build/firmware.bin