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Marc Herbert c30dffcc35 zephyr/cmake: BUILD_ALWAYS for smex and sof-logger 
Discovered the hard way that the Zephyr build assumes sof-logger is
always up to date when present. It's not clear from cmake's
ExternalProject documentation why that is the case. In any case
BUILD_ALWAYS fixes the issue and takes very little time because it does
not rebuild sof-logger from scratch. BUILD_ALWAYS is already used for
XTOS.

Fixes commit f6c71c21d0 ("zephyr/CMakeLists.txt: build smex and
sof-logger")

Signed-off-by: Marc Herbert <marc.herbert@intel.com>
 		2021-12-03 10:21:20 +00:00
..
include/sof zephyr/atomic.h: add a no-op cast: (long)atomic_read() 2021-11-19 11:16:50 +00:00
CMakeLists.txt zephyr/cmake: BUILD_ALWAYS for smex and sof-logger 2021-12-03 10:21:20 +00:00
Kconfig zephyr: enable cached heap by default for Intel cAVS platforms 2021-10-15 09:28:28 +01:00
README zephyr: Update README to add instruction for debug loggin on qmeu 2020-07-23 14:58:25 +01:00
docker-build.sh zephyr/docker-build: fix "stale" ZEPHYR_SDK_INSTALL_DIR comment 2021-09-29 16:58:24 +01:00
edf_schedule.c zephyr: (cosmetic) fix indentation 2021-09-07 13:34:31 +01:00
module.yml zephyr/module.yml: add URL, name: and comment out default values 2021-07-13 15:56:49 +01:00
schedule.c zephyr: schedule: enable multi-core scheduling 2021-05-05 11:03:35 +01:00
wrapper.c pm_runtime: prepare secondary cores for power down in d0->d0ix flow 2021-11-08 13:25:44 +00:00

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
======================

Zephyr support is still WiP and moving fast so it's best to use the latest
code. Some familiarity of SOF and Zephyr is also needed here.

SOF
---

repo: git@github.com:thesofproject/sof.git

branch: lrg/topic/zephyr-app on the SOF repo


Zephyr
------

repo: git@github.com:thesofproject/zephyr.git

branch: intel_adsp_soc_family

Building
========

SOF on Zephyr only using the UP^2 platform atm, but it should be possible to
add others platforms as the features are validated on UP^2.

Please checkout the SOF repo to zephyrproject/modules/audio/sof

Then from zephyr directory.

% source zephyr.sh

This will setup the Zephyr environment, code can then be built

% west build -p always  -b up_squared_adsp samples/basic/minimal
% west sign -t rimage -- -k ../../sof/sof/rimage/keys/otc_private_key.pem


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.