2020-04-20 18:31:11 +08:00
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SOF with Zephyr RTOS
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====================
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SOF currently uses the Cadence Xtos/HAL and it's own kernel functions as
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its RTOS. SOF is moving to use Zephyr as it's RTOS in parallel to current
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releases using xtos.
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The initial "alpha" of SOF on Zephyr will use the Zephyr RTOS for boot, IRQs,
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scheduling and memory allocation. Subsequent release will use more Zephyr
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functionality as code is moved from SOF to Zephyr (i.e. EDF scheduler updates
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copied from SOF to Zephyr).
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Building SOF on Zephyr
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======================
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Zephyr support is still WiP and moving fast so it's best to use the latest
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code. Some familiarity of SOF and Zephyr is also needed here.
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SOF
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---
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repo: git@github.com:thesofproject/sof.git
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branch: lrg/topic/zephyr-app on the SOF repo
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Zephyr
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------
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repo: git@github.com:thesofproject/zephyr.git
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branch: intel_adsp_soc_family
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Building
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========
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SOF on Zephyr only using the UP^2 platform atm, but it should be possible to
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add others platforms as the features are validated on UP^2.
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Please checkout the SOF repo to zephyrproject/modules/audio/sof
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Then from zephyr directory.
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% source zephyr.sh
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This will setup the Zephyr environment, code can then be built
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% west build -p always -b up_squared_adsp samples/basic/minimal
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% west sign -t rimage -- -k ../../sof/sof/rimage/keys/otc_private_key.pem
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2020-04-20 21:29:03 +08:00
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Testing on Qemu
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===============
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Get the SOF qemu sof-v4.2 branch here.
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git@github.com:thesofproject/qemu.git
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Configure as
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./configure' '--prefix=.' '--target-list=xtensa-softmmu,x86_64-softmmu' \
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'--enable-gtk' '--enable-sdl' '--enable-spice' \
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'--audio-drv-list=alsa' '--enable-libusb' \
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'--enable-usb-redir' '--enable-coroutine-pool' \
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'--disable-opengl' '--enable-fdt'
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Then run make.
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FW can be tested as follows using the qemu helper script.
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./xtensa-host.sh apl \
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-r ../../sof/sof/build_apl_gcc/src/arch/xtensa/rom-apl.bin \
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-k ../../zephyrproject/zephyr/build/zephyr/zephyr.ri
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Where -r and -k are used to specify the ROM and kernel files.
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The ROMS can be built from the SOF repo by running
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./scripts/xtensa-build-all.sh -r -a
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2020-04-22 00:59:08 +08:00
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Using console
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-------------
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Using logging and simulator backend with processing printk (LOG_PRINTK)
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can bring console in qemu.
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- Enable xtensa simulator logging backend (LOG_BACKEND_XTENSA_SIM).
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- Enable printk processing(LOG_PRINTK)
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- Add "-semihosting" to qemu command line. Make sure it goes through scripts to real qemu.
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