What was in the Morello 1.5 Release?

The Morello 1.5 Release includes:

•  Migrated build environment to Ubuntu Linux 20.04 LTS

• Android/Morello
  • Partial Pure-cap kernel/user ABI support
  • Switch to new Pure-cap variadic PCS
  • Refine dynamic linkage support

• Linux kernel
  • Switched to mainline-based branch (5.18 as of this release)
  • Experimental support for the pure-capability kernel-user ABI (PCuABI);

• Toolchain
  • ABI updates
  • Newlib/libgloss now supports processing RELATIVE relocations for initializing capabilities, in addition to the already supported caprelocs style relocations.
  • Code generation improvements for purecap

• Linux Purecap Environment
  • A Debian 11 based environment to demonstrate the Pure-cap applications executing on a mainline-based fork of Linux kernel (5.18) with experimental support for the pure-capability kernel-user ABI (PCuABI).
  • Morello support-enabled BusyBox file-system with sample pure-cap applications packaged to the Debian root file-system.
  • Musl, used to compile the purecap applications, is built with libshim disabled.
  • Prebuilt LLVM toolchain, and Musl binaries packaged with the environment.
  • Support to use Morello Board as a development platform for the Linux

• Platform Features
  • EFI GOP support
  • SCP->PCC communication path changed to I2C
  • SBBR Compliant Aarch64 Binaries included
  • Unified ROM binaries for SoC & FVP and hosted at ROM Binaries
  • CheriBSD shutdown/reboot EL3 exception issue fixed in TF-A
  • MCC Refresh to introduce new commands to fetch firmware version
  • DDR Dual Rank (64Gb) support
  • Fixed UEFI variable flash storage corruption
  • AP cores now boot at 2.5GHz

For full details and known limitations see Release Note.