7.8. Changelog

7.8.1. Version 2026.10

Interrupt and Timer Support

  • Improved ECLIC multi-hart routing and M/S-mode interrupt support.

  • Added ECLIC V2 automatic context save/restore, shadow GPRs and nested-trap handling.

  • Fixed ECLIC interrupt tail-chaining and jalmnxti return behavior.

  • Fixed ECLIC state reset so interrupts continue to work after a restart.

  • Reworked the SysTimer around shared MTIME state.

  • Improved Sstc integration on EvalSoC.

  • Improved multicore timer delivery, timer control and RV32 compare access.

  • Improved CIDU distribution, inter-core interrupts, semaphores and supervisor access control.

  • Improved PLIC interrupt routing and integration.

  • Improved AIA configuration, IMSIC address alignment and KVM AIA integration.

CPU Features and Extensions

  • Added Nuclei sMPU protection.

  • Added Nuclei stack-bound checking.

  • Added RNMI and double-trap extension support.

  • Added NICE plugin support for Nuclei NICE and VNICE instructions.

  • Added Zicfilp, Zicfiss, Zibi, Zimop and Zcmop extension support.

  • Fixed incorrect results for several Nuclei Xxldsp instructions.

  • Fixed Xxlcz GP-relative stores, operand-boundary behavior and RV64 support.

  • Fixed BF16/VBF16 extension dependencies, conversions and reciprocal-estimate behavior.

  • Fixed Nuclei custom VNICE instructions.

  • Adjusted RVV tail-agnostic handling to match Nuclei hardware behavior.

  • Improved fractional-LMUL instruction behavior and dependency validation.

  • Fixed crashes when writing some Nuclei custom CSRs.

  • Fixed scratch-stack switching for synchronous exceptions nested inside ECLIC interrupts.

  • Updated the default RISC-V Privileged ISA specification version to 1.13.

Peripheral and SoC Module Support

  • Added Nuclei USART support.

  • Added Nuclei QSPI support.

  • Added Nuclei uDMA support.

  • Added Nuclei XEC Ethernet controller support.

  • Added Nuclei MISC support.

  • Added IREGION capability register support.

  • Improved SD-card SPI CRC handling.

  • Removed UART1.

EvalSoC Configuration and Boot

  • Expanded soc-cfg support for device instantiation, MMIO sizes and partial overrides.

  • Added irqmax validation.

  • Improved memory-map overlap checks.

  • Added big-endian guest support and ELF-based automatic endianness detection.

  • Added ELF ISA compatibility validation.

  • Removed the MROM reset trampoline.

Platform Compatibility and Fixes

  • Fixed GLib version-related warnings in the Windows QEMU build.

7.8.2. Version 2025.10

  • Iregion now can be accessed via 1-8bytes per ops

  • Adjust the configuration of ELEN

  • Support pausing Nuclei systimer

  • Support smode ECLIC

  • Add support for Nuclei xxlfbf & xxlvfbf extensions

  • Add optional AIA APLIC & IMSIC support on nuclei_evalsoc

  • Cherry-pick Smcntrpmf extension support

  • Add Nuclei N300e core support

  • Update to reflect the overflow flag of xxldsp instructions through ‘ucode’

  • Implement some Nuclei custom csrs

  • Fixed some issues related to csr access

  • Adapt the SSTC extension on nuclei_evalsoc

  • Add zhinx/zhinxmin/zdinx imply rules

  • Fixed the support for single-letter input of the ‘ext=’ option

  • Increase the default size of the flash to 64MB

  • Fixed overflow caused by setting the ‘mtimecmp’ too large in clint timer

  • Trigger system reset rather than systimer reset when writing ‘msftrst’

  • Fix a series of issues during interrupt handling in eclic

7.8.3. Version 2025.02

  • Synchronize to the upstream QEMU 9.0

  • Remove the Nuclei Demosoc support

  • Add new cpu support for the Nuclei 200 and 1000 series

  • Add Nuclei custom Xxlvqmacc extension support

  • Add basic support for Nuclei gpio, qspi, test finisher, etc

  • Zilsd/Zclsd extensions sync to upstream releases 1.0

  • Add support for rv32/64 linux-user

  • The maximum number of cpus supported by the Nuclei evalsoc smp has been adjusted from 16 to 64

  • Fixed failure to respond to external interrupt in ECLIC

  • Fixed Nuclei systimer support in CLINT mode

7.9. Known Issues

For a summary of reported Nuclei QEMU issues, see https://github.com/riscv-mcu/qemu/issues/1.

7.9.1. Fixed issues on Nuclei Qemu 2026.10