OpenSBI Version 1.7

This release has:

• New parameter in top-level Makefile for reproducible builds
• Added MIPS P8700 platform support
• Allow arbitrary path in LLVM parameter of top-level Makefile
• Improved SBI v3.0 extensions to match frozen specification
• Emulate AMO instructions when Zaamo is not available
• Stop the harts waiting for HSM start from supervisor software
• Improved generic platform overrides to use common fdt_driver helpers
• Improved SBI MPXY framework to use per-domain data
• Added support for control transfer records (CTR) ISA extension
• Use LR and SC when Zaamo ISA extension is not available
• Added PXA UART support
• Added support for double-trap ISA extensions
• Optimized hartid and scratch lookup
• Added unit tests for bitwise operations
• Added unit tests for SBI ecall functionality
• Constify various FDT driver definitions
• Added MPXY RPMI mailbox driver for System MSI service group
• Improved RPMI drivers to match frozen specifications
• Initialize miscellaneous early drivers in one pass
• Use fdt_driver helpers for irqchip driver framework
• Allow adding SSE events dynamically at boot-time
• Simple singly linked list implementation

Overall, this release adds more ISA extensions and does many device driver improvements.

OpenSBI Version 1.6

This release has:

• Support for parsing riscv,isa-extensions DT property
• Setup serial console very early in cold boot path
• Support for multiple heaps and aligned memory allocation
• Support for shadow stacks (Zicfiss) ISA extension
• Support for landing pads (Zicfilp) ISA extension
• Support for per-domain data
• Support for double-trap (Smdbltrp/Ssdbltrp) ISA extensions
• DT-based configurable heap size
• Common fdt_driver and helpers for driver initialization
• Support for SBI PMU raw event v2 (Experimental)
• Simple FDT based mailbox driver framework
• RPMI shared memory transport driver (Experimental)
• RPMI system reset driver (Experimental)
• Simple FDT based system suspend driver framework
• RPMI system suspend driver (Experimental)
• Simple FDT based HSM driver framework
• RPMI HSM driver (Experimental)
• Simple FDT based CPPC driver framework
• RPMI CPPC driver (Experimental)
• SBI Message Proxy (MPXY) extension (Experimental)
• Simple FDT based MPXY driver framework
• Common RPMI client driver for MPXY (Experimental)
• Support for vector misaligned load/store

Overall, this release adds more ISA extensions, drivers, and other improvements.

OpenSBI Version 1.5.1

This intermediate release has following fixes:

• Save/restore menvcfg only when it exists
• Adjust Sscofpmf mhpmevent mask for upper 8 bits
• Fix potential NULL pointer dereferences in SBI DBTR
• Fix incorrect size passed to sbi_zalloc() in SBI FWFT
• Check result of pmp_get() in is_pmp_entry_mapped()

OpenSBI Version 1.5

This release has:

• SBI debug triggers (DBTR) extension (Experimental)
• Support to specify coldboot harts in DT
• Relocatable FW_JUMP_ADDR and FW_JUMP_FDT_ADDR
• Smcsrind and Smcdeleg extensions support
• SBIUnit testing framework
• Initial domain context management support
• Platform specific load/store emulation callbacks
• New trap context
• Improved sbi_trap_error() to dump state in a nested trap
• SBI supervisor software events (SSE) extension (Experimental)
• Simplified wait_for_coldboot() implementation
• Early wakeup of non-coldboot HART in the coldboot path
• Sophgo CV18XX/SG200X series support
• APLIC delegation DT property fix
• Svade and Svadu extensions support
• SBI firmware features (FWFT) extension (Experimental)

Overall, this release mainly adds more ISA extensions, SBI extensions and other improvements.

OpenSBI Version 1.4

This release has:

• Synopsys DesignWare APB GPIO driver
• Zicntr and Zihpm support
• Console print improvements
• Smepmp support
• Simple FDT based syscon regmap driver
• Syscon based reboot and poweroff driver
• Non-contiguous hpm counters
• Smcntrpmf support
• Full sparse hartid support
• IPI improvements
• RFENCE improvements
• Zkr support
• Andes custom PMU support

Overall, this release mainly adds more ISA extensions, drivers and other improvements.

OpenSBI Version 1.3.1

This intermediate release has:

• ACLINT driver fix for disabled CPUs
• SBI PMU fix for out-of-bound access
• Designware GPIO driver

Overall, this is our first intermediate release with a crucial
for ACLINT drivers.

OpenSBI Version 1.3

This release has:

• Allow platform to influence cold boot HART selection
• Starfive JH7110 platform support
• Split RX and RW firmware regions
• Advertise non-retentive suspend for allwinner D1 platform
• Byteorder/endianness conversion macros
• SBI debug console extension (Experimental)
• Configure the PMA regions for RZ/Five platform
• SBI system suspend extension (Experimental)
• SBI PMU platform firmware events (Experimental)
• SBI CPPC extension (Experimental)
• Optimized remote TLB flushes
• Simple heap for boot time memory allocations
• Bring back no-map DT property for reserved memory nodes

Overall, this release mainly adds new SBI extensions along with other improvements.

OpenSBI Version 1.2

This release has:

• Menuconfig support using Kconfiglib v14.1.0
• RISC-V AIA v1.0.0 support
• Cadence UART driver
• Platform specific PMU device operations
• Trap handling improvements for platforms with H-extension
• Semihosting support
• T-HEAD C9XX PMU and CLINT support
• FDT based drivers for Andes AE350 platform
• Andes AE350 platform improvements
• Allow enabling/disabling of SBI extensions via Kconfig
• Renesas SCIF serial driver
• Renesas RZ/Five platform support

Overall, this release mainly adds Kconfig support, new drivers and new platforms along with other improvements.

OpenSBI Version 1.1

This release has:

• SBI PMU improvements
• RISC-V AIA v0.3.0 draft support
• Simple external interrupt handling framework
• Xilinx UART-Lite driver
• RISC-V privilege specification v1.12 support
• RISC-V Svpbmt extension support
• RISC-V Smstateen extension support
• RISC-V Sstc extension support
• RISC-V privilege specification version detection
• Platform callback to populate HART extensions
• Compile time C arrays support
• Probing FDT based drivers using compile time C arrays
• SBI HSM improvements
• Allwinner D1 platform support
• Trap redirection improvements related to [m|h]tinst CSR
• SBI v1.0 specification support

Overall, this release mainly adds support for various RISC-V ISA extensions ratified in December 2021 along with other improvements.

OpenSBI Version 1.0

This release has:

• SBI HSM suspend defined by SBI v0.3 specification
• Position independent execution for firmware
• Ticket based spinlocks
• Simplified / reduced platform callbacks
• ACLINT MTIMER and MSWI support
• SBI PMU extension defined by SBI v0.3 specification
• Simple FDT based GPIO driver framework
• Improved reset driver framework along with various reset drivers
• Generic timer delay loop APIs
• RISC-V Sscofpmf extension support
• Simple FDT based I2C driver framework along with SiFive I2C driver
• UART drivers for Gaisler and LiteX platforms

Overall, this release completes a major milestone by implementing the SBI v0.3 specification along with various other improvements.