Linux 5.6 内核已经发布，多系列处理器迎来一波更新

Linux 5.6 has some newsworthy changes including:

• USB4 support – The Thunderbolt specification has morphed into USB4 and the kernel configuration options for Thunderbolt have been renamed accordingly.
• WireGuard VPN (Virtual Private Network) is now part of Linux 5.6 networking stack
• Preliminary support for the first-generation Amazon Echo
• The Linux kernel is now year-2038 ready as all users of the 32-bit time_t type have been fixed.

Some notable changes related to Arm architecture:

• Allwinner
  • Allwinner A10 – CSI (BT656 and Parallel)
  • Allwinner A64 – MIPI DSI, DVFS
  • Allwinner A64 / A83T / H3 / H5 / H6 – Thermal
  • Allwinner H6 – PWM
  • Allwinner H3 / H5 / H6 / R40 – PMU
  • Allwinner R40 – CSI (BT656 and Parallel) and SPI
• Rockchip
  • Media – Staging driver for Rockchip MIPI Synopsys DPHY RX0
  • DRM – Add support for PX30
  • Ethernet (not only Amlogic) – RTL8211F Rx/Tx delay configuration tested on ODROID-C1 and Khadas VIM2
• • Clock drivers – Add Amlogic meson8b DDR clock controller and input clocks to Amlogic meson8b controllers; some fixed for mali clock and pll driver
  • Media – Amlogic SM1 adds support for MPEG1 and MPEG2 decoders
  • DRM – Added driver for the ARM Framebuffer Compression decoders found in the Amlogic GXM and G12A SoCs
• Samsung
  • Switch from legacy to atomic pwm API in rx1950 (s3c24xx),
  • Defconfig changes
    • Bring back explicitly wanted options which were removed through
      make savedefconfig. savedefconfig removes options selected by
      other symbols, however developers of this other symbol can remove
      anytime ‘select’ statement.
    •  Enable NFS v4.1 and v4.2, useful in testing/CI systems.
    •  Enable thermal throttling through devfreq framework.
  • DTS Updates
    1. Couple ARM and wcore bus regulators on Exynos542x so higher
       frequencies could be used with dynamic voltage and frequency scaling.
       Enable these higher frequencies.
    2. Correct the polarity of USB3503 hub GPIOs.
    3. Adjust the bus frequencies (scaled with devfreq framework) on Exynos5422 Odroid boards to match values possible to obtain from root PLLs.
    4. Add display to Tiny4412 board.
    5. Cleanups and minor improvements.
• Qualcomm
  • Added support for Qualcomm SC7180 (8-core 64bit SoC, unnamed CPU class)
  • Driver updates:
    • SCM major refactoring and cleanup
    • Properly flag active only power domains as active only
    • Add SC7180 and SM8150 RPMH power domains
    • Return EPROBE_DEFER from QMI if packet family is not yet available
  • DTS updates:
    • Add SAW L2 nodes to boot secondary cpus on IPQ40xx
    • Fix remaining IRQ_TYPE_NONE on APQ8084
    • Update tsens node to new style
    • Add modem remoteproc node to MSM8974
    • Move ADSP SMD edge into ADSP remoteproc node for MSM8974
    • Add and enable wireless communication subsystem on MSM8974 and Fairphone 2
    • Add MSM8974 interconnect provider nodes
    • Add MSM8974 OCMEM node
  • DTS ARM64 updates:
    • Align SDM845 firmware paths with linux-firmware
    • Make WiFi work on Dragonboard845c
    • Wire up wakeup controller for SDM845
    • Critical thermal interrupt support for SDM845, MSM8996 and MSM8998
    • SM8150 – Enable UFS, add remoteproc enablers and nodes, add CPUfreq, add RPMH power-domain node
    • Cleanup and refactor MSM8996 dts structure
    • MS8996 – Increase core voltage, fix USB phy settings
    • MSM8998 – Add missing alias for BLSP UART in MTP, add remoteproc nodes for ADSP, modem and sensor core, enable WiFI
    • Add CPUfreq, QUPs, USB, remoteproc etc for SC7180
    • Enable USB OTG for Dragonboard 410c
    • Add vibrator motor node for PM8916
    • Properly specify APCS clocks for MSM8916
    • Add CPR and HFPLL for QCS404
    • Enable full CPUfreq (with AVS) for QCS404
  • Defconfig updates:
    • Enable NVMEM and OSM CPUfreq drivers
    • Enable CPR driver
    • Enable HFPLL driver
    • Enable ATH10k SNOC driver
    • Enable PMIC thermal driver
    • Enable wakeup controller driver
    • Enable watchdog driver
    • Enable PRNG driver
    • Enable SN65DSI86 DSI to DisplayPort bridge driver
    • Enable QCA Bluetooth driver
    • Enable Qualcomm SoCinfo driver
    • Enable SPI and QSPI drivers
    • Enable drivers providing remoteproc dependencies
    • Enable anx78xx HDMI bridge driver
    • Enable MSM8974 interconnect provider driver
• MediaTek
  • ASoC – Add MediaTek MT6660 Speaker Amp Driver
  • USB – support for MediaTek musb controller in
    host, peripheral and otg mode
• Other new Arm hardware platforms and SoCs:
  • Atmel/Microchip – SAM9X60 ARM926 SoC
  • Marvell – Armada 385-based SolidRun Clearfog GTR
  • NXP – Gateworks GW59xx boards based on i.MX6/6Q/6QDL/i.MX6sl/i.MX7ULP/i.MX8MQ
  • ST Ericsson – ab8505 (variant of ab8500) and db8520 (variant ofdb8500) SoCs; Samsung Galaxy S III mini (GT-I8190), HREF520 reference board for DB8520
  • STMicro – STM32MP15 SoCs (1-2 Cortex-A7, CAN, GPU depending on SKU), and reference boards
  • Texas Instruments – OMAP 37xx gets split into AM3703/AM3715/DM3725, which are all variants of it with different GPU/media IP configurations. Gen1 Amazon Echo (OMAP3630-based)
  • UNISOC – SC9863A SoC (8x Cortex-A55 mobile chipset w/ GPU, modem)

MIPS Linux 5.6 changelog:

•  Support mremap() for the VDSO, primarily to allow CRIU to restore
  the VDSO to its checkpointed location.
• Restore the MIPS32 cBPF JIT, after having reverted the enablement
  of the eBPF JIT for MIPS32 systems in the 5.5 cycle.
• Improve cop0 counter synchronization behavior whilst onlining CPUs
  by running with interrupts disabled.
• Better match FPU behavior when emulating multiply-accumulate
  instructions on pre-r6 systems that implement IEEE754-2008 style
  MACs.
• Loongson64 kernels now build using the MIPS64r2 ISA, allowing them
  to take advantage of instructions introduced by r2.
• Support for the Ingenic X1000 SoC & the really nice little CU Neo
  development board that’s using it.
• Support for WMAC on GARDENA Smart Gateway devices.
• Lots of cleanup & refactoring of SGI IP27 (Origin 2*) support in
  preparation for introducing IP35 (Origin 3*) support.
• Various Kconfig & Makefile cleanups

Changes for RISC-V architecture in Linux 5.6:

• Support for KASAN (KernelAddressSANitizer)
• 32-bit physical addresses on rv32i-based systems
• Support for CONFIG_DEBUG_VIRTUAL
• DT entry for the FU540 GPIO controller, which has recently had a device driver merged
• A series of Kconfig updates to ease selecting the drivers necessary
  to run on QEMU’s virt platform.
• DTS updates for SiFive’s HiFive Unleashed.