etc:users:jcmvbkbc:linux-xtensa
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etc:users:jcmvbkbc:linux-xtensa [2012/07/16 20:48] – jcmvbkbc | etc:users:jcmvbkbc:linux-xtensa [2023/07/12 06:25] (current) – add esp32s3 linux wifi notes jcmvbkbc | ||
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====== Linux port for Xtensa ====== | ====== Linux port for Xtensa ====== | ||
- | ===== Phase 1 ===== | + | * Linux git tree: https:// |
- | Goal: linux mainline contains the latest | + | * Build/test tools git tree: https:// |
- | * compilable with latest GCC | + | * Toolchain build scripts/overlays |
- | * overlays | + | * [[.:linux-xtensa: |
- | * tests to pass: builds, boots, LTP | + | * [[.:linux-xtensa: |
- | * boards to focus on: ISS, ML605 | + | * [[.:linux-xtensa: |
- | * configurations: UP, linux-next specific, more TBD | + | |
- | ===== Plan ===== | + | ===== TODO ===== |
- | * Prepare for linux-next participation | + | |
- | * [2/3] Make mainline build for ARCH=xtensa in defconfig, allnoconfig, | + | * dynamic ftrace |
- | * fix remaining issues with allmodconfig | + | * kgdb/kdb |
- | * what with GPIO? | + | * kexec |
- | * [+] try other fix for literals.unlikely | + | * NX |
- | * why there' | + | |
- | * [+] Make built images work (qemu, FSF and dc232b) | + | ===== In Progress ===== |
- | * Build userspace | + | |
- | * Analyse reference tree | + | * kprobes |
+ | * [[.:linux-xtensa: | ||
+ | * [[.: | ||
+ | * [[.: | ||
+ | |||
+ | ===== Features by release ===== | ||
+ | ==== Linux 6.4 ==== | ||
+ | |||
+ | * support | ||
+ | |||
+ | ==== Linux 6.1 ==== | ||
+ | |||
+ | * support for static PIE ELF executable format on noMMU | ||
+ | * partial support for FDPIC ELF executable format on noMMU (signal delivery is broken, fixed in 6.1.31) | ||
+ | |||
+ | ==== Linux 5.19 ==== | ||
+ | |||
+ | | ||
+ | * support protection faults on noMMU. | ||
+ | * support full tickless operation. | ||
+ | * KCSAN. | ||
+ | * hibernation. | ||
+ | |||
+ | ==== Linux 5.18 ==== | ||
+ | |||
+ | * support compiler plugins (with gcc-12 and newer). | ||
+ | * support | ||
+ | * removed dependency on compiler' | ||
+ | |||
+ | ==== Linux 5.16 ==== | ||
+ | |||
+ | * support for cores without windowed registers. | ||
+ | * call0 ABI kernel. | ||
+ | |||
+ | ==== Linux 5.13 ==== | ||
+ | |||
+ | * GDBIO semihosting. | ||
+ | |||
+ | ==== Linux 5.9 ==== | ||
+ | |||
+ | * syscall audit. | ||
+ | * seccomp filter. | ||
+ | |||
+ | ==== Linux 5.6 ==== | ||
+ | |||
+ | * exception vectors can be attached to the rest of the kernel or placed at specific address. | ||
+ | |||
+ | ==== Linux 5.5 ==== | ||
+ | |||
+ | | ||
+ | |||
+ | ==== Linux 5.4 ==== | ||
+ | |||
+ | * support for call0 ABI userspace. | ||
+ | |||
+ | ==== Linux 5.3 ==== | ||
+ | |||
+ | * ' | ||
+ | |||
+ | ==== Linux 5.2 ==== | ||
+ | |||
+ | * support for cores with exclusive access option. | ||
+ | * basic support for cores with MPU. | ||
+ | |||
+ | ==== Linux 5.1 ==== | ||
+ | |||
+ | * generic spinlock/ | ||
+ | |||
+ | ==== Linux 5.0 ==== | ||
+ | |||
+ | * memtest. | ||
+ | * Jump labels. | ||
+ | * tracehook. | ||
+ | * syscall tracepoints. | ||
+ | * multiple coprocessor fixes. | ||
+ | * SMP fixes. | ||
+ | |||
+ | ==== Linux 4.16 ==== | ||
+ | |||
+ | * KASAN. | ||
+ | * SSP. | ||
+ | * allocation of DMA buffers from high memory. | ||
+ | * support DMA_ATTR_NO_KERNEL_MAPPING. | ||
+ | * kernel is built with -mtext-section-literals and -mno-serialize-volatile. | ||
+ | |||
+ | ==== Linux 4.9 ==== | ||
+ | |||
+ | * New kernel memory layouts: with 256MBytes and 512MBytes of low memory. | ||
+ | * Configurable KSEG physical memory address and kernel load address. | ||
+ | * Custom sysmem boot time memory allocator is replaced with memblock. | ||
+ | * KMEMLEAK. | ||
+ | * reserved-memory DT node. | ||
+ | * Cadence Configurable System Platform | ||
+ | |||
+ | ==== Linux 4.6 ==== | ||
+ | |||
+ | * Hardware breakpoints/ | ||
+ | * ioremap for memory outside KIO region. | ||
+ | * Big endian: serial, network, i2c work. | ||
+ | |||
+ | ==== Linux 4.4 ==== | ||
+ | |||
+ | * DMA to high memory. | ||
+ | |||
+ | ==== Linux 4.3 ==== | ||
+ | |||
+ | * Hardware perf counters | ||
+ | |||
+ | ==== Linux 4.1 ==== | ||
+ | |||
+ | * ALSA playback driver for XTFPGA. | ||
+ | |||
+ | ==== Linux 3.19 ==== | ||
+ | |||
+ | * noMMU. | ||
+ | |||
+ | ==== Linux 3.17 ==== | ||
+ | |||
+ | * Highmem on cores with aliasing cache. | ||
+ | * New (simpler) method of configuring for specific core variant. | ||
+ | |||
+ | ==== Linux 3.16 ==== | ||
+ | |||
+ | * Stability: xtensa linux may be rebuilt natively. | ||
+ | |||
+ | ==== Linux 3.15 ==== | ||
+ | |||
+ | * Highmem. | ||
+ | * KC705 board. | ||
+ | |||
+ | ==== Linux 3.14 ==== | ||
+ | |||
+ | * SMP. | ||
+ | * Futex. | ||
+ | * register spilling overhaul. | ||
+ | * OpenCores ethernet works when connected to gigabit network. | ||
+ | * c67x00 USB host is usable on XTFPGA. | ||
+ | * TAP network works in ISS. | ||
+ | |||
+ | ==== Linux 3.12 ==== | ||
+ | |||
+ | * Kernel preemption. | ||
+ | |||
+ | ==== Linux 3.11 ==== | ||
+ | |||
+ | * Multihit exceptions fixed. | ||
+ | * Static function tracer. | ||
+ | |||
+ | ==== Linux 3.10 ==== | ||
+ | |||
+ | * MMUv3 cores. | ||
+ | * Lockdep/ | ||
+ | |||
+ | ==== Linux 3.9 ==== | ||
+ | |||
+ | * TLS (THREADPTR register). | ||
+ | * Oprofile. | ||
+ | * ISS simdisk. | ||
+ | |||
+ | ==== Linux 3.8 ==== | ||
+ | |||
+ | * Device trees. | ||
+ | * uImage generation. | ||
+ | * IRQ subsystem overhaul (IRQ domains, medium-priority interrupts). | ||
+ | * XTFPGA boards. | ||
+ | * s32c1i-based atomic/bit operations and spinlocks. | ||
+ | |||
+ | ==== Linux 3.7 ==== | ||
+ | |||
+ | * Overall architecture port overhaul, mainline is alive again, builds and runs. | ||
+ | * There were dragons prior to that release. | ||
etc/users/jcmvbkbc/linux-xtensa.1342457330.txt.gz · Last modified: 2012/07/16 20:48 by jcmvbkbc