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.

OpenSBI Version 0.9

This release has:

• Lots of fixes and improvements
• Optimized trap handler for both RV32 and RV64
• Domain support for system-level partitioning
• Device tree based domain configuration
• SBI v0.3 SRST extension
• More detailed boot-time prints
• Makefile option to use toolchain default ISA and ABI

OpenSBI Version 0.8

This release has:

• Simple FDT timer driver framework
• Simple FDT ipi driver framework
• Simple FDT irqchip driver framework
• Simple FDT serial framework
• Generic FDT based platform support
• Nuclei UX600 platform support
• Detect HART CSRs at boot time
• Multi-PLIC support
• Multi-CLINT support
• Allow multiple builtin DTBs
• Hypervisor v0.6.1 specification support
• Shakti C-class platform support