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base repository: fupy/micropython
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head repository: fupy/micropython
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  • 4 commits
  • 24 files changed
  • 2 contributors

Commits on Jan 19, 2017

  1. Take a copy of the minimal target 

    Signed-off-by: Joel Stanley <joel@jms.id.au>
    @shenki @katharosada
    shenki authored and katharosada committed Jan 19, 2017
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  2. lm32: Basic port to the litex SoC with a lm32 CPU 

    This port requires a lm32 cross compiler with libgcc enabled.

I built a GCC 6.2 toolchain with newlib by doing the following:

  $ ls
  binutils-2.27  gcc-6.2.0  mpc-1.0.2   newlib-2.4.0.20161025
  gmp-6.1.1  mpfr-3.1.5
  $ mkdir build
  $ cd build
  $ ../gcc-6.2.0/configure  --prefix=/opt/lm32 --enable-languages=c --target=lm32-elf
  $ make
  $ mkdir /opt/lm32 && chown $USER /opt/lm32
  $ make install

Then build a litex Qemu with the following:

  $ git clone https://github.com/shenki/qemu-litex
  $ cd qemu-litex
  $ ./configure --target-list=lm32-softmmu
  $ make

To build Micropython:

  $ cd micropython/lm32
  $ CROSS_COMPILE=/opt/lm32/bin/lm32-elf- make deploy

This produces an elf at lm32/build/firmware.elf. To run it:

  ./lm32-softmmu/qemu-system-lm32 -M litex -nographic -nodefaults \
   -serial stdio -kernel ~/dev/micropython/lm32/build/firmware.elf
   MicroPython v1.8.6-12-g674efbf5680a on 2016-11-20; litex with lm32
   Type "help()" for more information.
   >>>

To debug it:

  ./lm32-softmmu/qemu-system-lm32 -M litex -nographic -nodefaults \
   -serial stdio -kernel ~/dev/micropython/lm32/build/firmware.elf \
   -S -s -monitor pty
  char device redirected to /dev/pts/12 (label compat_monitor0)

This requires a lm32 GDB:

  $ conda/bin/lm32-elf-gdb build/firmware.elf -ex 'target remote localhost:1234'
  Reading symbols from build/firmware.elf...done.
  Remote debugging using localhost:1234
  0x40000000 in _start ()
  (gdb) c
  Continuing.

You can attach to the monitor to view the lm32 registers that are not
exposed by qemu:

  screen /dev/pts/12
  (qemu) QEMU 2.7.50 monitor - type 'help' for more information
  (qemu) info registers
  IN: PC=40000000
  ie=00000000 (IE=0 EIE=0 BIE=0) im=00000000 ip=00000000
  eba=00000000 deba=00000000

The port currently assumes you are running on the opsis-soc, targeted
for the minispartan6. You can adjust this by replacing the
include/generated directories with the ones from your litex soc in both
Qemu and Micropython.

Signed-off-by: Joel Stanley <joel@jms.id.au>
    @shenki @katharosada
    shenki authored and katharosada committed Jan 19, 2017
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  3. Updated to use mimasv2 using headers from HDMI2USB build at commit 

    cbd1e31b3a9f88e0d1ecb682b51f6d41454766de
    @katharosada
    katharosada committed Jan 19, 2017
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  4. Got a working REPL!!! (implement uart)

    @katharosada
    katharosada committed Jan 19, 2017
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