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--- etc:users:jcmvbkbc:linux-xtensa [2014/04/14 07:34] – status update jcmvbkbc
+++ etc:users:jcmvbkbc:linux-xtensa [2023/07/12 06:25] (current) – add esp32s3 linux wifi notes jcmvbkbc
@@ Line 6: / Line 6: @@
   * [[.:linux-xtensa:patch-review-checklist]]
   * [[.:linux-xtensa:patch-pull-checklist]]
+  * [[.:linux-xtensa:rootfs]]
 ===== TODO =====
-  * highmem on cores with aliasing cache
+  * dynamic ftrace
-  * support xtfpga audio hardware in ALSA
+  * kgdb/kdb
-    * clock synthesizer
+  * kexec
-    * I2S interface
+  * NX
-  * deliver signals raised in double exceptions
-  * TIE coprocessors (23ae3f723c8996d47ef205e98cb7732bbde4775f)
-  * ptrace (support latest GDB) (617244763e19a4eebb4fabe41ba56eb1ccbdb049, 23ae3f723c8996d47ef205e98cb7732bbde4775f, <del>ff1b10f85a1176d1eb8df433434b717f6f0841d4</del> (already upstream), <del>a2b61af3328025d6069e8bf9ff36f5288e11dba9</del>)
-  * ticket spinlocks
-  * fixes for debugability (continuous stack trace over exceptions at least)
-===== Done =====
+===== In Progress =====
-=== Highmem support ===
-Done, in the -next
-=== Limit PHY connected to OpenCores MAC to 10/100 MBits/s speeds ===
-Done, in the mainline:
-<code>
-a48c net: ethoc: don't advertise gigabit speed on attached PHY
-a13aff0 net: ethoc: set up MII management bus clock
-</code>
-=== SMP support ===
-Done, in the mainline:
-<code>
-d5040 xtensa: keep a3 and excsave1 on entry to exception handlers
-daa xtensa: fix arch spinlock function names
-6235153 xtensa: update clockevent setup for SMP
-cbd1de2 xtensa: move built-in PIC to drivers/irqchip
-a8e96 xtensa: add MX irqchip
-f615136 xtensa: add SMP support
-b424f xtensa: implement CPU hotplug
-</code>
-=== Clean up and fix ISS networking ===
-Done, in the mainline:
-<code>
-f3cd60b xtensa: ISS: clean up iss-network driver
-c8ad85 xtensa: ISS: fix command line parameter name
-b181 xtensa: ISS: init network interface name before the probe
-fd8 xtensa: ISS: drop IP setup, clean up MAC setup
-f6ac5a1 xtensa: ISS: enable iss_net_set_mac
-e14b4 xtensa: ISS: always use fixed tuntap config
-a6e16b9 xtensa: ISS: clean up diagnostic, increase verbosity
-</code>
-=== oprofile ===
-<del>8c502ca703956e56bf191774e4169752f0f71c8e, 7dd1d39e70769f2dd7a6a508d58b187ed8d1cb95</del>
-Done, in the mainline:
+  * kprobes
-<code>
+  * [[.:linux-xtensa:esp32]]
-e6ffe17 xtensa: add support for oprofile
+  * [[.:linux-xtensa:esp32s3]]
-f5bf0 xtensa: fix oprofile building as module
+  * [[.:linux-xtensa:esp32s3wifi]]
-</code>
-=== simdisk ===
-<del>1a955825662fa378d447b91485d9fe2438124b0a, 8bcbc3adb5c5bfdbd96078c1e68916be859c832d</del>
-Done, in the mainline:
+===== Features by release =====
-<code>
+==== Linux 6.4 ====
-b6c7e87 xtensa: ISS: add host file-based simulated disk
-</code>
-=== Medium level interrupts in less hacky way ===
-<del>489fb47c75772e3a41ef3e988eb0c0e512592085</del>
-Done, in the mainline:
+  * support for FDPIC ELF executable format on noMMU
-<code>
-d1c645 xtensa: dispatch medium-priority interrupts
-a xtensa: disable IRQs while IRQ handler is running
-</code>
-=== Interrupt management ===
-Done, in the mainline:
-<code>
-d5d xtensa: add IRQ domains support
-</code>
-=== Cache aliasing aware mmap ===
-Done, in the mainline:
-<code>
-de73b6b xtensa: avoid mmap cache aliasing
-</code>
-=== Atomics (arch/xtensa/include/asm/atomic.h, bitops.h, spinlock.h) and check for S32C1I ===
-Merged in the eb0a9bf31fdbcee9463c0f42fbf4a292ef149a7d, pick up from individual files.
-Done, in the mainline:
+==== Linux 6.1 ====
-<code>
-f6ea6a xtensa: display s32c1i feature flag in cpuinfo
+  * support for static PIE ELF executable format on noMMU
-b xtensa: save and restore scompare1 SR on kernel entry
+  * partial support for FDPIC ELF executable format on noMMU (signal delivery is broken, fixed in 6.1.31)
-c622b29 xtensa: initialize atomctl SR
-e8 xtensa: add trap_set_handler function
+==== Linux 5.19 ====
-0027312 xtensa: add s32c1i sanity check
-b1e4 xtensa: add s32c1i-based atomic ops implementations
+  * support coprocessors on SMP.
-e5a9f6a xtensa: add s32c1i-based bitops implementations
+  * support protection faults on noMMU.
-b5 xtensa: add s32c1i-based spinlock implementations
+  * support full tickless operation.
-bf77 xtensa: fix mb and wmb definitions
+  * KCSAN.
-</code>
+  * hibernation.
-=== Generic kernel_thread & friends ===
-Done, in the mainline:
+==== Linux 5.18 ====
-<code>
-a72 xtensa: switch to generic kernel_thread()
+  * support compiler plugins (with gcc-12 and newer).
-f0a1bf0 xtensa: switch to generic kernel_execve()
+  * support for kernel ABI selection.
-dc241f2 xtensa: switch to generic sys_execve()
+  * removed dependency on compiler's libgcc.
-</code>
-=== Support for Tensilica FPGA boards (xtfpga) ===
+==== Linux 5.16 ====
-  * [+] serial
-  * [+] ethernet
+  * support for cores without windowed registers.
-  * [+] FLASH
+  * call0 ABI kernel.
-  * [-] audio
-In the mainline:
+==== Linux 5.13 ====
-<code>
-d456ba xtensa: add support for the XTFPGA boards
+  * GDBIO semihosting.
-b4d xtensa: add XTFPGA DTS
-</code>
+==== Linux 5.9 ====
-=== Device trees support ===
-Done, in the mainline:
+  * syscall audit.
-<code>
+  * seccomp filter.
-da844a8 xtensa: add device trees support
-</code>
+==== Linux 5.6 ====
-=== MMU v3 ===
-Done, in the mainline:
+  * exception vectors can be attached to the rest of the kernel or placed at specific address.
-<code>
-e85e335 xtensa: add MMU v3 support
+==== Linux 5.5 ====
-e294a xtensa: document MMUv3 setup sequence
-</code>
+  * 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.