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armstub7: Major refactoring and size improvements #117

Merged
merged 2 commits into from
Oct 8, 2020
Merged

armstub7: Major refactoring and size improvements #117

merged 2 commits into from
Oct 8, 2020

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fincs
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@fincs fincs commented Sep 24, 2020

My motivation for this PR is #114 (comment), pointing out a critical lack of space in the armv7 bootstub which is preventing new features and bugfixes from being implemented. Here's a summary of the changes (I might have missed some, though):

  • The bootstub has been completely rewritten taking advantage of the Thumb-2 instruction set, which results in major space gains
  • Res0 bits of NSACR are no longer set (supersedes armstub7: Various fixes #85)
  • CNTVOFF is set to zero, now consistent with armstub8 (supersedes armstub7: Also reset CNTVOFF #113)
  • SMC instructions are now disabled, now consistent with armstub8
  • ACTLR is now configured to allow Non-secure access to several CPU configuration registers (CPUACTLR/CPUECTLR/L2CTLR/L2ECTLR/L2ACTLR), which makes it possible to e.g. enable Spectre v4 mitigations directly in the kernel without needing a separate bootstub variant (potentially supersedes add Cortex-A72 Spectre v4 (CVE-2018-3639) mitigation #115); armstub8 also updated to configure ACTLR in the same way

The free space in each bootstub built from armstub7.S is now as follows:

armstub7.bin:        108 bytes
armstub8-32.bin:     104 bytes
armstub8-32-gic.bin:  44 bytes (!)

Successful testing has been carried out on Raspberry Pi 2 (original revision with Cortex-A7), Pi 3, as well as Pi 4; respectively.

I'm also providing the raw disassembly of these stubs, in case anyone is curious about it.

Any further comments (such as pointing out mistakes I might have introduced) are very much appreciated.

- The bootstub has been completely rewritten taking advantage of the
  Thumb-2 instruction set, which results in major space gains
- Res0 bits of NSACR are no longer set (supersedes #85)
- CNTVOFF is set to zero, now consistent with armstub8 (supersedes #113)
- SMC instructions are now disabled, now consistent with armstub8
- ACTLR is now configured to allow Non-secure access to several CPU
  configuration registers (CPUACTLR/CPUECTLR/L2CTLR/L2ECTLR/L2ACTLR),
  which makes it possible to e.g. enable Spectre v4 mitigations directly
  in the kernel without needing a separate bootstub variant
  (potentially supersedes #115)

Free space in each affected bootstub after this commit:

  armstub7.bin:        108 bytes
  armstub8-32.bin:     104 bytes
  armstub8-32-gic.bin:  44 bytes (!)
@pelwell
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pelwell commented Oct 7, 2020

Sorry it's taken a while to get round to looking at this PR. I'm still working through the code, but it's at least booted successfully on a variety of devices.

One thing that bothers me is the setting of the SMD bit as part of the secure monitor call. Since there is one smc instruction in the stub, does that mean that once the stub hands over to the "kernel" that no other smc calls are allowed? How does that affect U-boot which the now-deleted comment claims uses smc?

@fincs
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fincs commented Oct 7, 2020

No worries, I imagine with the current events it's difficult to find time/resources for anything.

Since there is one smc instruction in the stub, does that mean that once the stub hands over to the "kernel" that no other smc calls are allowed?

That is correct, SMC instructions are no longer allowed when using the stub. This makes it consistent with the 64-bit stub, which has never allowed SMCs either.

How does that affect U-boot which the now-deleted comment claims uses smc?

I was puzzled by the comment as well, but after some digging I discovered it was just copypasted from u-boot's own SMC handler. I believe u-boot does not use SMC on Raspberry Pi, as that would require loading a "kernel" into address 0 (which would bypass the armstub, so even if it does this change doesn't affect it anyway). I haven't found any evidence of CONFIG_ARMV7_NONSEC being enabled on Raspberry Pi either (which is what causes SMC related code to be included in u-boot).

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pelwell commented Oct 7, 2020

Thanks - that makes a lot of sense.

I'll probably look at it for a bit longer, trying to pretend I understand it all, then merge it.

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pelwell commented Oct 8, 2020

Any concerns, @popcornmix?

@popcornmix
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Let's give it a try. The extra space will be nice to have.

@pelwell pelwell merged commit fc0e73c into raspberrypi:master Oct 8, 2020
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pelwell commented Oct 8, 2020

I'll grab the generated header for the firmware.

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pelwell commented Oct 8, 2020

And thank you!

popcornmix added a commit to raspberrypi/firmware that referenced this pull request Oct 8, 2020
See: raspberrypi/tools#117

firmware: Revert sdcard: Reduce SD read overhead

firmware: arm_loader: Add GET/SET_VPU_VECTOR mailbox calls
popcornmix added a commit to Hexxeh/rpi-firmware that referenced this pull request Oct 8, 2020
See: raspberrypi/tools#117

firmware: Revert sdcard: Reduce SD read overhead

firmware: arm_loader: Add GET/SET_VPU_VECTOR mailbox calls
mkreisl added a commit to xbianonpi/xbian-package-firmware that referenced this pull request Jan 12, 2021
- firmware: Unicam: Request frequency of 250MHz when running camera use cases

- firmware: arm_loader: Fix UART unmapping

- firmware: uart1: Revert to the old core-frequency-locking method
  See: #1267

- firmware: arm_loader: Provide a sensible device_tree_end default
  See: #1259

- firmware: mmal_ril: Fix size reported on ENOSPC error
  See: #1269

- firmware: hvs: Trigger the EOLn timer at the field rate when interlaced
  See: #1227

- firmware: bootloader_state: Add support for a custom TFTP prefix parameter

- firmware: arm_loader: GIC stub => 2711 stu
- See: #1255

- firmware: arm_loader: Add os_prefix option
  See: raspberrypi/linux#3237

- firmware: Add support for arbitrary memory specification

- firmware: arm_loader: Fix explicit kernel name handling
  See: #1277

- firmware: Added a new display power mailbox call

- firmware: Update display_power gencmd with optional display id
  See: raspberrypi/linux#3050

- firmware: Remove legacy pkgconfig to avoid Mesa conflicts
  See: raspberrypi/userland#585

- firmware: Update display_power gencmd with optional display id

- firmware: sysman: Fix unsafe check for h264 being enabled
  See: popcornmix/omxplayer#749

- firmware: platform: Reduce absolute microvolts threshold to 500000

- firmware: tv_server: Also initialise ts queue on composite
  See: https://forum.kodi.tv/showthread.php?tid=348205

- firmware: Loop to init hotplug

- firmware: hdmi: Change HDMI state machine and BVB clocks as turbo clocks

- firmware: hdmi: Add EOF timeout to unjam failed mode changes

- firmware: platform: Differentiate between boostable and turbo clocks

- firmware: arm_dt: Set WL_ON and BT_ON from .dtb

- firmware: Fixup chosing of bit depth in legacy graphics
  See: raspberrypi/linux#3331

- firmware: vec: Setup WideScreen Signalling outside of copy protection
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=256489

- firmware: Add global reset mailbox

- firmware: 2711: De-couple start.elf clock setup from the bootloader

- firmware: scaler: Correct defines for SCALER_POS0_START_Y_[MASK|SHIFT] (HVS4)

- firmware: platform: Fix missing HDMI PHY power down bit

- firmware: Reduce voltage as part of DVFS

- firmware: arm-loader: Inherit 2711 mac-address from the bootloader
  See: http://git/vc4/vc4/merge_requests/687

- firmware: arm_loader: Respect all required frequencies when throttling

- firmware: Fixup vcgencmd display_power return values

- firmware: platform: Allow fixed voltage with avs_disable=1

- firmware: EMMC: Use PLLD for EMMC for 250MHz host-clock
  See: #1289

- firmware: platform: Round down effective frequencies when they exceed max
  See: #1290

- firmware: arm_loader: Pass video mode via kernel command for composite
  See: #1285

- firmware: Fix lens shading table generation buglet
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=190586&start=75#p1534672

- firmware: hdmi: Use RB2 timing for 2560x1440@60 if pixel clock is 241.5 MHz

- firmware: arm_dt: Look for ethernet0 before ethernet

- firmware: arm_dt: Set PCIe dma-ranges from memory size

- firmware: hdmi: HDMI SM clock must not run slower than audio MAI clock
  See: #1295

- firmware: arm_loader: Pass video mode via kernel command for composite (master)
  See: #1285

- firmware: power: Use Pi4 PMIC values on Pi3+

- firmware: Fix filtered handling of array variables
  See: #1296

- firmware: Update libfdt to v1.5.1+
  See: raspberrypi/userland#582

- firmware: dtoverlay: Extend DT parameter syntax

- firmware: memorymap: Include FW revision in start.elf

- firmware: Fixup for vcgencmd display_power
  See: #1224

- firmware: Add hdmi_wifi_pixel_freq_adj config option

- firmware: Revert mmal: Support 64 bit clients
  See: raspberrypi/userland#586

- firmware: arm_dt/dtoverlay fixes for ARM side camera driver power control

- firmware: arm_ldconfig: Support multiple initramfs files
  See: #1318

- firmware: Add support for backlight enable

- firmware: master: arm_ldconfig: Support multiple initramfs files
  See: #1318

- firmware: power: Make pmicrd/pmicwr available to all

- firmware: platform: Only throttle down from arm_freq

- firmware: platform: Bump desired ring osc to 3.7 on Pi3/CM3

- firmware: arm_loader: Add 2ms delay before resetting SD_IO

- firmware: isp/tuner: Resetting to a lamp mode cancels manual_gains_used_

- firmware: board_info: Fix uninitialised phy_addr handling in network boot

- firmware: IL video_decode: Default to H264 as MPEG4 isn't supported

- firmware: IL egl_render: Fail the create on Pi4

- firmware: arm_dispmanx: Column pitch for YUV10COL is in lines not bytes

- firmware: platform: 2711: Also add chicken bits to dvfs voltage

- firmware: MMAL / video_render: Allow column stride to be set on column formats

- firmware: vc_image/video_decode: Move +16 lines for di_adv from vc_image to decoder

- firmware: platform: 2711: Support overclocking gpu frequencies
  See: #1290

- firmware: gencmd: Fix measure_clock name for CLOCK_OUTPUT_108

- firmware: mmal isp: Remote alignment requirements for RGB24 formats

- firmware: Add missing flags for VC_IMAGE_PROP_YUVUV_4K_CHROMA_ALIGN

- firmware: platform: Compromise on gpu overclock settings
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=262649&start=100#p1610362

- firmware: Add the ability to export labels from overlays

- firmware: loader: 4-byte align initramfs blocks
  See: #1318

- firmware: vd3/video_decode: Do not add 16 lines of context when video is 1920 tall
  See: #1334

- firmware: Allow use of 24 bit framebuffers
  See: #1338

- firmware: arm_loader: Add non-os_prefix cmdline.txt fallback

- firmware: board_info: Set board-info memory size according to SDRAM mode registers

- firmware: arm_loader: Treat min frequencies as optional
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=264786

- firmware: arm_loader: Add overvoltage_delta for manufacture tests

- firmware: Support Isp stats and params

- firmware: arm_loader: Make EMMC2 dma-ranges patch more tolerant

- firmware: bootromfs: Delete unwanted assert

- firmware: usb_eth: Increase timeouts for TFTP requests and retransmit ACK

- firmware: isp component: rtos_common_mem: Fix handle acquire usage with wrap handles

- firmware: il: video_render: Require 4k chroma alignment on YUVUV transpose
  See: #1334

- firmware: vc_image: Don't align the YUVUV pitch to SDRAM pages if not aligning to 4k
  See: raspberrypi/linux#3492

- firmware: isp component: rtos_common_mem: Fix smallalloc test in mem_handle_acquire_if_valid

- firmware: platform: 2711: Make chicken-bit pip size vary with pmic quantum

- firmware: USB device boot for CM4

- firmware: arm_loader: Add SET_LAUNCH_VPU1 mailbox message

- firmware: il: camera: Add config.txt param awb_auto_is_greyworld for NoIR camera
  See: #1167

- firmware: arm_loader: Provisional support for high peris

- firmware: arm_loader: Only add margins to cmdline if non-zero

- firmware: clock: Support clock_measure_pll on pi0-3

- firmware: platform: Back to CLOCK_PLL_CHAN_CPER for emmc on pi0-3

-  firmware: gpu_server: Fixup after LAUNCH_VPU1 commit

- firmware: power: Add a notch to compensate for trim on 2835

- firmware: isp/tuner: Resetting to a lamp mode cancels manual_gains_used_ (master)

- firmware: armstubs: Rebuild with latest source

- firmware: arm_loader: Avoid resetting the GPIO expander

- firmware: vcos_genversion: Fix up legacy variant names

- firmware: dtoverlay: Add overlay_map functionality
  See: raspberrypi/linux#3520

-  firmware: isp_tuner: Add in the slave AWB tuner handling

- firmware: arm_dt: Apply os_prefix to device_tree= files

- firmware: clock_2711: Fix PLL analog setup

- firmware: board_info: Also include CM3+ for pmic trait
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=267576&start=25#p1643032

- firmware: Switch to building from common firmware branch

- firmware: isp: make AGC metering respect the (digital zoom) crop region

- firmware: Avoid linking in khronos on Pi4

- firmware: clock: Reset PLLC after switching VPU to OSC

- firmware: arm_loader: Make 4GB available if arm_peri_high

- firmware: arm_loader: Complete arm_peri_high support
  See: #1374

- firmware: board_info: Split Model B into rev1 and rev2
  See: raspberrypi/linux#3537

- firmware: power: Clamp voltage to platform limits for all power supplies

- firmware: isp: Ensure lens shading (LS) is enabled when a valid LS table is received

- firmware: otp: Fix advanced boot row definition

- firmware: bootcode: Fix issue booting with webcams

- firmware: isp: fix ISP component to return non-zero focus FoMs

- firmware: Fix for IMX477 focal length, f_number and aperture

- firmware: Update firmware for USB MSD boot

- firmware: platform: Fix overflow on high arm overclocks

- firmware: video_encode: Add option to include header bytes with frame

- firmware: DSI display: Close I2C handle if the display doesn't probe

- firmware: mmal/vc: Add mapping for OMX_IndexConfigBufferStall / MMAL_PARAMETER_VIDEO_STALL_THRESHOLD
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=70&t=273123&p=1655481

- firmware: hdmi: Request an I2C interrupt for EDID reading

- firmware: i2c: Move using_interrupt flag into periph_setup

- firmware: camera: Latency reduction for captures

- firmware: IL camera fixes for reduced startup time

- firmware: mmal_ril: Correct a use of portdef.video to portdef.image

- firmware: vc_image: SDRAM page alignment is optional for YUV10_COL
  See: https://forum.libreelec.tv/thread/21985-noise-artefacts-when-playing-back-4k-hevc-video-on-rpi4-le-9-2-1-no-problems-on/

- firmware: imx477: Correct the logic for extending hblank on long exposures

- firmware: il: isp: Ensure HR output is active and ISP is open before starting a frame

- firmware: isp_ctrl: Fail in start_[raw|yuv]_frame if ISP is not idle
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=275489

- firmware: vcfw: Fix PMIC max voltage
  See: https://forum.libreelec.tv/thread/22097-libreelec-leia-9-2-3

- firmware: ISP raw14 and mono input, 16bpc YUV output. Camera subsystem not messing with GPIO0

- firmware: isp: fix assert from initial setting of ISP denoise parameters

- firmware: arm_ldconfig: Don't pad initramfs files
  See: #1395

- firmware: board_info: Add and use BT_FLOWCONTROL trait

- firmware: logging: Add missing checks for uart_output_enabled

- firmware: host_applications: Install debug_sym.h

- firmware: logging: Inherit uart_2ndstage config from the bootloader

- firmware: Fix Pi4 regression in previous build

- firmware: platform: Resolve BT flow control contention
  See: Hexxeh/rpi-firmware#227

- firmware: hdmi: Limit the valid CEA modes to those defined in the table
  See: https://forum.libreelec.tv/thread/22135-regression-raspberry-pi-3-hdmi-output-broken-after-upgrade-to-9-2-x

- firmware: imx477: Add switch to allow switching of on-sensor DPC

- firmware: hdmi: Set HD_CTL_WHOLSMP and HD_CTL_CHALIGN_SET
  See: https://forum.kodi.tv/showthread.php?tid=354589

- firmware: arm_ldconfig: Honour the kernel8 text offset
  See: #1415

- firmware: jpeghw: Skip repeated 0xFF padding bytes between markers
  See: RPi-Distro/vlc#8

- firmware: arm_loader: Allow interlaced HDMI modes from FKMS
  See: raspberrypi/linux#3698

- firmware: arm_loader: Limit rather than reject boosts with disable_auto_turbo

- firmware: i2c: Clearing the TA bit may time out
  See: #1422

- firmware: arm_loader: Add an accelerated memmove

- firmware: arm_loader: memmove kernel to preferred text_offset
  See: #1421

- firmware: filesystem: Fix GPT regression on USB after SD fix
  See: #1420

- firmware: arm_loader: Don't enable the ARM USB IRQ
  See: raspberrypi/linux#3703

- firmware: hdmi: Remove M2MC/BVB min turbo clock request

- firmware: IL: camera: Fix stereoscopic pool allocations

- firmware: arm_loader: Add support for double clock/pixel_rep for FKMS
  See: raspberrypi/linux#3725

- firmware: scalerlib: Set the default chroma location for YUV10 to match 8bit

- firmware: scalerlib: Set chroma_vrep correctly for YUV10COL

- firmware: isp: check the hi-res resize filter mode when the input crop changes

- firmware: arm_loader: Knock 1.7 seconds off boot time
  See: #1375

- firmware: Imx477 external sync signals

- firmware: bootloader: Some tweaks for LED, UART, USB timeouts

- firmware: platform: Avoid vco issue with low arm_freq_min on Pi0-3
  See: #1431

- firmware: arm_loader: Don't try to load to 0 a.k.a. NULL
  See: #1445

- firmware: armstub7: Configure the top 32 STB interrupts

- firmware: dispmanx: Remove elements cleanly that are totally offscreen negatively
  See: raspberrypi/linux#3735

- firmware: hdmi: Set the altered mode, not the caller's mode
  See: #1446

- firmware: dt-blob: Declare CM4 GPIO expander pins

- firmware: clocks: Make frequency_t 64-bit

- firmware: Revert frequency_t: Make 64-bit

- firmware: ISP/tuner: Increase max exposure time for fixed ISO modes on IMX219 and 477
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=281603

- firmware: sdhost_arasan: Ignore DCRC after CMD12
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=282928

- firmware: firmware: frequency_t: Make 64-bit

- firmware: pi4: allow pllb changes while running
  See: #1431

- firmware: board_info: Give the CUSTOM boards the PMIC_NCP6343 trait

- firmware: dispmanx/displays: Allow both DPI and DSI displays simultaneously

- firmware: imx477: Release the I2C semaphore once finished, not before

- firmware: clock: Allow overclocking pllb
  See: raspberrypi/linux#3823

- firmware: hdmi/edid: Reduce the bias to all but the first detailed timing

- firmware: hdmi/edid: Add option to ignore any odd horizontal timings on Pi4

- firmware: sdcard: Hybrid MBR - only select GPT if it is the first primary partition
  See: #1465

- firmware: audioplus: Avoid broken audio when requesting hdmi audio device when using composite display
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=283639

- firmware: platform: Add support for SCB clock and set to 250MHz

- firmware: Revert arm_loader: Move first call to set_turbo after arm->start

- firmware: arm_ldconfig: GZIP-compressed ARMv8 kernel support

- firmware: arm_ldconfig: Restore the fallback load address
  See: #1467

- firmware: ilcamera: Disable timeouts on trigger sink devices

- firmware: genet: Flush RBUF/TBUF and clear mac-address on stop
  See: raspberrypi/linux#3850

- firmware: dmalib: Add support for 40-bit 2d memcpy

- firmware: sdcard: Reduce SD read overhead

- firmware: sdhost_arasan: Increase time threshold before suspend

- firmware: video_decode: Only shutdown codec on both ports being disabled

- firmware: vc_image_helper: Avoid misaligned exception due to uninitialised pointer

- firmware: arm_loader: Make arm clock accesses only see their own boosts
  See: #1469

- firmware: arm_loader: enable simple_fb iff there is a display
  See: raspberrypi/linux#3878

- firmware: arm_loader: Mark V3D early boost as for the ARM
  See: #1469

- firmware: arm_loader: Update armstubs with those from PR 117
  See: raspberrypi/tools#117

- firmware: Revert sdcard: Reduce SD read overhead

- firmware: arm_loader: Add GET/SET_VPU_VECTOR mailbox calls

- firmware: arm_ldconfig: Don't invalidate the dcache for most of memory
  See: #1445

- firmware: arm_loader: Allow arm to see force_turbo and uart boosts

- firmware: hdmi: Timeout HDMI EDID reads

- firmware: pwm_sdm: move modulator to VPU0
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=29&t=195178&p=1723639

- firmware: Add tryboot mechanism to provide a fallback if an OS upgrade fails

- firmware: camplus: stills_denoise: Release the VRF between iterations

- firmware: vc_image: Further fixup of fix_alignment
  See: #1334

- firmware: arm_loader: Support large PCIe window with <8GB RAM
  See: https://www.raspberrypi.org/forums/viewtopic.php?p=1759627#p1759627

- firmware: filesys: Close the brfs from filesys_power(..., 0)

- firmware: platform: Avoid vco issue with low arm_freq_min on Pi0-3
  See: #1431

- firmware: video_encode: Allow level 5.0 and 5.1
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=291447

- firmware: xhci: Don't reset BCM2711 XHCI from filesys in start.elf

- firmware: bootcode.bin: Add support for tryboot

- firmware: Switch DA9121 PMIC to PWM mode when ARM > 600 MHz

- firmware: arm_dt: Handle parent interrupt controllers when masking

- firmware: config: Add cm4 and pi400 config section filters

- firmware: MMAL/IL/ISP component: Set the ISP boost frequency once on open

- firmware: sdcard: Remove legacy NOOBS support to support booting from primary partition 4

- firmware: arm_loader: Move 2711 RAM to PCIe address 16GB

- firmware: video_decode: Add parameter to disable timestamp validation

- firmware: Imx477 camera tuning fixes
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=291032#p1770287
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=43&t=291032&start=25#p1771066

- firmware: Use DMA40 for PWM audio

- firmware: imx477: Replace existing 720p120 mode with a new 1332x990 120fps mode

- firmware: arm_loader: Allow max_framebuffers=0 to disable framebuffers
  See: #1507

- firmware: dmalib: Allow sdcard to borrow channel 6
  See: #1511
  See: Hexxeh/rpi-firmware#251
  See: https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=294932

- firmware: DSI interrupt fixes, and HDMI SM clock for deep colour

- firmware: dmalib: Keep 40-bit DMA clear of L2 alias

- firmware: audioplus: Fix hang when switching destination
  See: #1516

- firmware: HAT/I2C updates

- firmware: MMAL/IL: Add support for the 16bpp Bayer/Grey raw 10/12/14 formats

- firmware: Revert firmware: HAT/I2C updates

- firmware: firmware: MMAL/IL: Add support for the 16bpp Bayer/Grey raw 10/12/14 formats

- Firmware: undo previous reverts
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3 participants