etc:users:jcmvbkbc:linux-xtensa
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etc:users:jcmvbkbc:linux-xtensa [2012/11/11 01:02] – todo 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, | + | |
- | * [+] fix remaining issues with allmodconfig | + | |
- | * why there' | + | |
- | * qemu needs proper handling for guest ioctls triggered via simcalls | + | |
- | * [+] Make built images work (qemu, FSF) | + | |
- | * [+] Build userspace | + | |
- | * Automated build/test scripts | + | |
- | * [+] build/test status/ | + | |
- | * expect script to run LTP | + | |
- | * Analyse reference tree | + | |
- | * proper bugfixes | + | |
- | * new cores (dc233c, test_hifi_c3, | + | |
- | * new platforms (lx*, ml605, s*) | + | |
- | * SMP and its fixes | + | |
- | * XCC fixes | + | |
- | * [[.: | + | |
- | ===== Work items ===== | + | * dynamic ftrace |
- | === SMP support | + | * kgdb/kdb |
- | === Support | + | * kexec |
- | * [+] serial | + | * NX |
- | * [+] ethernet | + | |
- | * [-] FLASH | + | ===== In Progress |
- | * [-] audio | + | |
- | === Atomics | + | * kprobes |
- | Merged in the eb0a9bf31fdbcee9463c0f42fbf4a292ef149a7d, | + | * [[.: |
- | === TIE coprocessors | + | * [[.: |
- | 23ae3f723c8996d47ef205e98cb7732bbde4775f | + | * [[.: |
- | === Highmem | + | |
- | === Interrupt management | + | ===== Features by release ===== |
- | === Medium level interrupts in less hacky way === | + | ==== Linux 6.4 ==== |
- | 489fb47c75772e3a41ef3e988eb0c0e512592085 | + | |
- | === Device trees support === | + | * support |
- | On the xtensa-fixes branch. | + | |
- | === MMU v3 === | + | ==== Linux 6.1 ==== |
- | === ptrace | + | |
- | 617244763e19a4eebb4fabe41ba56eb1ccbdb049, 23ae3f723c8996d47ef205e98cb7732bbde4775f, ff1b10f85a1176d1eb8df433434b717f6f0841d4, | + | * support for static PIE ELF executable format on noMMU |
- | === Support | + | * partial support for FDPIC ELF executable format on noMMU (signal delivery is broken, fixed in 6.1.31) |
- | === simdisk | + | |
- | 1a955825662fa378d447b91485d9fe2438124b0a, | + | ==== Linux 5.19 ==== |
- | === Various fixes made for debuggability | + | |
- | === oprofile | + | * support coprocessors on SMP. |
- | 8c502ca703956e56bf191774e4169752f0f71c8e, | + | * support protection faults on noMMU. |
- | === Generic kernel_thread & friends | + | * support full tickless operation. |
- | Done, in the mainline. | + | * KCSAN. |
- | === Cache aliasing aware mmap === | + | * hibernation. |
+ | |||
+ | ==== Linux 5.18 ==== | ||
+ | |||
+ | * support compiler plugins | ||
+ | * support for kernel ABI selection. | ||
+ | * removed dependency on compiler' | ||
+ | |||
+ | ==== Linux 5.16 ==== | ||
+ | |||
+ | * support | ||
+ | * 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 ==== | ||
+ | |||
+ | * eXecute In Place (XIP) kernel. | ||
+ | |||
+ | ==== Linux 5.4 ==== | ||
+ | |||
+ | * support for call0 ABI userspace. | ||
+ | |||
+ | ==== Linux 5.3 ==== | ||
+ | |||
+ | * ' | ||
+ | |||
+ | ==== Linux 5.2 ==== | ||
+ | |||
+ | * support | ||
+ | * basic support for cores with MPU. | ||
+ | |||
+ | ==== Linux 5.1 ==== | ||
+ | |||
+ | * generic spinlock/ | ||
+ | |||
+ | ==== Linux 5.0 ==== | ||
+ | |||
+ | * memtest. | ||
+ | * Jump labels. | ||
+ | * tracehook. | ||
+ | * syscall tracepoints. | ||
+ | * multiple coprocessor | ||
+ | * 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 and perf support. | ||
+ | |||
+ | ==== Linux 4.1 ==== | ||
+ | |||
+ | * ALSA playback driver | ||
+ | |||
+ | ==== 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.1352581361.txt.gz · Last modified: 2012/11/11 01:02 by jcmvbkbc