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Marc Herbert 125d372b19 docker-build.sh: don't switch versions when already initialized 
Restore ability to use (and test!) zephyr/docker-build.sh locally
without overwriting work in progress.

Fixes commit b371373f7d ("scripts: docker-build.sh updated with
changes from xtensa-build-zephyr.py")

Signed-off-by: Marc Herbert <marc.herbert@intel.com>
 		2022-08-04 09:46:22 +01:00
..
include/sof zephyr: update for recent Zephyr include path changes 2022-08-03 20:59:53 +01:00
CMakeLists.txt src: enable hifi4 optimized src build with zephyr 2022-07-27 23:08:16 +01:00
Kconfig dma: add Zephyr native DMA support to host & dai 2022-05-31 15:28:27 +01:00
README zephyr: replace obsolete README section with link to sof-docs 2022-02-07 10:43:28 +00:00
docker-build.sh docker-build.sh: don't switch versions when already initialized 2022-08-04 09:46:22 +01:00
edf_schedule.c zephyr: use zephyr prefix for includes 2022-07-18 14:22:01 +01:00
module.yml zephyr: module: point to where the app is 2022-07-18 14:22:01 +01:00
schedule.c zephyr: schedule: enable multi-core scheduling 2021-05-05 11:03:35 +01:00
wrapper.c timer: Introduce sof_cycle_get_64 2022-08-01 11:09:39 +01:00

README 

SOF with Zephyr RTOS
====================

SOF currently uses the Cadence Xtos/HAL and it's own kernel functions as
its RTOS. SOF is moving to use Zephyr as it's RTOS in parallel to current
releases using xtos.

The initial "alpha" of SOF on Zephyr will use the Zephyr RTOS for boot, IRQs,
scheduling and memory allocation. Subsequent release will use more Zephyr
functionality as code is moved from SOF to Zephyr (i.e. EDF scheduler updates
copied from SOF to Zephyr).

Building SOF on Zephyr
======================

Section promoted to
https://thesofproject.github.io/latest/getting_started/build-guide/build-with-zephyr.html

Testing on Qemu
===============

Get the SOF qemu sof-v4.2 branch here.

git@github.com:thesofproject/qemu.git

Configure as

./configure' '--prefix=.' '--target-list=xtensa-softmmu,x86_64-softmmu' \
             '--enable-gtk' '--enable-sdl' '--enable-spice' \
             '--audio-drv-list=alsa' '--enable-libusb' \
             '--enable-usb-redir' '--enable-coroutine-pool' \
             '--disable-opengl' '--enable-fdt'

 Then run make.

FW can be tested as follows using the qemu helper script.

 ./xtensa-host.sh apl \
     -r ../../sof/sof/build_apl_gcc/src/arch/xtensa/rom-apl.bin \
     -k ../../zephyrproject/zephyr/build/zephyr/zephyr.ri

Where -r and -k are used to specify the ROM and kernel files.

The ROMS can be built from the SOF repo by running

./scripts/xtensa-build-all.sh  -r -a

Using console
-------------

Using logging and simulator backend with processing printk (LOG_PRINTK)
can bring console in qemu.

 - Enable xtensa simulator logging backend (LOG_BACKEND_XTENSA_SIM).
 - Enable printk processing(LOG_PRINTK)
 - Add "-semihosting" to qemu command line. Make sure it goes through scripts to real qemu.