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--- etc:users:jcmvbkbc:linux-xtensa [2012/07/19 19:21] – progress jcmvbkbc
+++ etc:users:jcmvbkbc:linux-xtensa [2023/07/12 06:25] (current) – add esp32s3 linux wifi notes jcmvbkbc
@@ Line 1: / Line 1: @@
 ====== Linux port for Xtensa ======
-===== Phase 1 =====
+  * Linux git tree: https://github.com/jcmvbkbc/linux-xtensa
-Goal: linux mainline contains the latest linux-xtensa updates, builds and works.
+  * Build/test tools git tree: https://github.com/jcmvbkbc/xtensa-linux-test
-  * compilable with latest GCC
+  * Toolchain build scripts/overlays git tree: https://github.com/jcmvbkbc/xtensa-toolchain-build
-  * overlays to cover: FSF, dc232b, more TBD
+  * [[.:linux-xtensa:patch-review-checklist]]
-  * tests to pass: builds, boots, LTP
+  * [[.:linux-xtensa:patch-pull-checklist]]
-  * boards to focus on: ISS, ML605
+  * [[.:linux-xtensa:rootfs]]
-  * configurations: UP, linux-next specific, more TBD
-===== Plan =====
+===== TODO =====
-  * Prepare for linux-next participation
-    * [3/3] Make mainline build for ARCH=xtensa in defconfig, allnoconfig, allmodconfig
+  * dynamic ftrace
-      * [+] fix remaining issues with allmodconfig
+  * kgdb/kdb
-        * concept of IO space? IO mapping?
+  * kexec
-      * [+] try other fix for literals.unlikely
+  * NX
-      * why there's no simdisk in the mainline?
-    * [2/3] Make built images work (qemu, FSF)
+===== In Progress =====
-  * Build userspace
-  * Analyse reference tree
+  * kprobes
+  * [[.:linux-xtensa:esp32]]
+  * [[.:linux-xtensa:esp32s3]]
+  * [[.:linux-xtensa:esp32s3wifi]]
+===== Features by release =====
+==== Linux 6.4 ====
+  * support for FDPIC ELF executable format on noMMU
+==== 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 coprocessors on SMP.
+  * support protection faults on noMMU.
+  * support full tickless operation.
+  * KCSAN.
+  * hibernation.
+==== Linux 5.18 ====
+  * support compiler plugins (with gcc-12 and newer).
+  * support for kernel ABI selection.
+  * removed dependency on compiler's libgcc.
+==== 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 ====
+  * eXecute In Place (XIP) kernel.
+==== Linux 5.4 ====
+  * support for call0 ABI userspace.
+==== Linux 5.3 ====
+  * 'virt' board (sim with PCI, corresponding board model available in QEMU since v4.2).
+==== Linux 5.2 ====
+  * support for cores with exclusive access option.
+  * basic support for cores with MPU.
+==== Linux 5.1 ====
+  * generic spinlock/rwlock.
+==== 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 (CSP).
+==== Linux 4.6 ====
+  * Hardware breakpoints/watchpoints.
+  * 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 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/stack tracing.
+==== 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.