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etc:users:jcmvbkbc:linux-xtensa [2022/05/20 08:57] – jcmvbkbcetc:users:jcmvbkbc:linux-xtensa [2023/07/12 06:25] (current) – add esp32s3 linux wifi notes jcmvbkbc
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   * [[.:linux-xtensa:patch-review-checklist]]   * [[.:linux-xtensa:patch-review-checklist]]
   * [[.:linux-xtensa:patch-pull-checklist]]   * [[.:linux-xtensa:patch-pull-checklist]]
 +  * [[.:linux-xtensa:rootfs]]
  
 ===== TODO ===== ===== TODO =====
Line 17: Line 18:
  
   * kprobes   * kprobes
-  * coprocessors support in SMP+  * [[.:linux-xtensa:esp32]] 
 +  * [[.:linux-xtensa:esp32s3]] 
 +  * [[.:linux-xtensa:esp32s3wifi]]
  
-===== Done =====+===== Features by release ===== 
 +==== Linux 6.4 ====
  
-=== GDBIO semihosting interface === +  * support for FDPIC ELF executable format on noMMU
-Done, in the mainline: +
-  * [[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6a8eb99e130f3f7658de2776934374fe1c41279e|xtensa: ISS: add GDBIO implementation to semihosting interface]]+
  
-=== Seccomp and audit === +==== Linux 6.1 ====
-Done, in the mainline: +
-<code> +
-da94a40f7285 xtensa: add seccomp support +
-ef1a935c08ea xtensa: add audit support +
-</code>+
  
-=== eXecute In Place === +  * support for static PIE ELF executable format on noMMU 
-[[.:linux-xtensa:xip|XIP]] done, in the mainline: +  * partial support for FDPIC ELF executable format on noMMU (signal delivery is broken, fixed in 6.1.31)
-<code> +
- 7af710d98877 xtensa: add XIP kernel support +
-</code>+
  
-=== QEMU virt machine === +==== Linux 5.19 ====
-Done, in the mainline: +
-<code> +
-775f1f7eaced xtensa: virt: add defconfig and DTS +
-</code>+
  
-=== support for cores with MPU === +  * support coprocessors on SMP. 
-Done, in the mainline: +  * support protection faults on noMMU. 
-<code> +  * support full tickless operation. 
-a5944195d00a xtensa: implement initialize_cacheattr for MPU cores +  * KCSAN. 
-</code>+  * hibernation.
  
-=== exclusive access support (l32ex/s32ex) === +==== Linux 5.18 ====
-Done, in the mainline: +
-<code> +
-f7c34874f04a xtensa: add exclusive atomics support +
-</code>+
  
-=== ticket spinlocks === +  * support compiler plugins (with gcc-12 and newer). 
-Done, in the mainline: +  * support for kernel ABI selection. 
-<code> +  * removed dependency on compiler's libgcc.
-af3d890b4303 xtensa: provide xchg for sizes 1 and 2 +
-579afe866f52 xtensa: use generic spinlock/rwlock implementation +
-</code>+
  
-=== support xtfpga audio hardware in ALSA === +==== Linux 5.16 ====
-Done, in the mainline: +
-<code> +
-57b7068de5d0 ASoC: add xtensa xtfpga I2S interface and platform +
-0c7665c35602 clk: TI CDCE706 clock synthesizer driver +
-3a33a85401ec i2c: ocores: fix clock-frequency binding usage +
-e961a094afe0 i2c: ocores: add common clock support +
-c2c62e61fb85 xtensa: xtfpga: add audio card to xtfpga DTS +
-04ddc5b5ad4e xtensa: xtfpga: provide defconfig with audio subsystem +
-</code>+
  
 +  * support for cores without windowed registers.
 +  * call0 ABI kernel.
  
-=== fixes for debuggability (continuous stack trace over exceptions at least) === +==== Linux 5.13 ====
-Done, in the mainline: +
-<code> +
-b6569439f1ce xtensa: keep exception/interrupt stack continuous +
-</code>+
  
-=== NoMMU fixes === +  * GDBIO semihosting.
-Done, in the xtensa-fixes branch: +
-<code> +
-f04f3cb xtensa: nommu: move init_mmu stub to nommu_context.h +
-67dbc24 xtensa: nommu: provide __invalidate_dcache_page_alias stub +
-ae73a13 xtensa: nommu: provide _PAGE_CHG_MASK definition +
-1103273 xtensa: nommu: provide MAP_UNINITIALIZED definition +
-de03359 xtensa: nommu: don't provide arch_get_unmapped_area +
-4ee9b59 xtensa: nommu: don't build most of the cache flushing code +
-8cd28c7 xtensa: nommu: add MMU dependency to DEBUG_TLB_SANITY +
-93c3d27 xtensa: nommu: fix Image.elf reset code and ld script +
-1b929c7 xtensa: nommu: fix load address definitions +
-7c5b218 xtensa: nommu: fix uImage load address +
-e40e0ee xtensa: move vecbase SR initialization to _startup +
-f698bc8 xtensa: nommu: set up cache and atomctl in initialize_mmu +
-48243b5 xtensa: nommu: reserve memory below PLATFORM_DEFAULT_MEM_START +
-ceef25a xtensa: nommu: clean up memory map dump +
-8fd689e xtensa: make PLATFORM_DEFAULT_MEM parameters configurable +
-</code> +
-=== Deliver signals raised in double exceptions === +
-Not really needed. Replaced with alignment double exception fixup, special handler for user stack alignment and deprecation of fast atomic and spill syscalls. In the mainline (v3.17-rc3): +
-<code> +
-c3ef1f4 xtensa: add double exception fixup handler for fast_unaligned +
-e9500dd xtensa: make fast_unaligned store restartable +
-3cfc096 xtensa: don't allow overflow/underflow on unaligned stack +
-9184289 xtensa: deprecate fast_xtensa and fast_spill_registers syscalls +
-</code> +
-=== Highmem on cores with aliasing cache === +
-Done, in the mainline (v3.17-rc3): +
-<code> +
-22def76 xtensa: make fixmap region addressing grow with index +
-dec7305 xtensa: allow fixmap and kmap span more than one page table +
-7128039 xtensa: fix TLBTEMP_BASE_2 region handling in fast_second_level_miss +
-a91902d xtensa: implement clear_user_highpage and copy_user_highpage +
-32544d9 xtensa: support aliasing cache in k[un]map_atomic +
-8504b50 xtensa: support aliasing cache in kmap +
-270eec7 xtensa: support highmem in aliasing cache flushing code +
-</code> +
-=== Highmem support === +
-Done, in the mainline: +
-<code> +
-6555910 xtensa: add HIGHMEM support +
-</code> +
-=== Limit PHY connected to OpenCores MAC to 10/100 MBits/s speeds === +
-Done, in the mainline: +
-<code> +
-445a48c 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> +
-99d5040 xtensa: keep a3 and excsave1 on entry to exception handlers +
-5515daa xtensa: fix arch spinlock function names +
-6235153 xtensa: update clockevent setup for SMP +
-cbd1de2 xtensa: move built-in PIC to drivers/irqchip +
-26a8e96 xtensa: add MX irqchip +
-f615136 xtensa: add SMP support +
-49b424f xtensa: implement CPU hotplug +
-</code> +
-=== Clean up and fix ISS networking === +
-Done, in the mainline: +
-<code> +
-3f3cd60b xtensa: ISS: clean up iss-network driver +
-8c8ad85 xtensa: ISS: fix command line parameter name +
-358b181 xtensa: ISS: init network interface name before the probe +
-8991fd8 xtensa: ISS: drop IP setup, clean up MAC setup +
-f6ac5a1 xtensa: ISS: enable iss_net_set_mac +
-35e14b4 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: +==== Linux 5.9 ====
-<code> +
-e6ffe17 xtensa: add support for oprofile +
-74f5bf0 xtensa: fix oprofile building as module +
-</code> +
-=== simdisk === +
-<del>1a955825662fa378d447b91485d9fe2438124b0a, 8bcbc3adb5c5bfdbd96078c1e68916be859c832d</del>+
  
-Done, in the mainline: +  * syscall audit. 
-<code> +  * seccomp filter.
-b6c7e87 xtensa: ISS: add host file-based simulated disk +
-</code> +
-=== Medium level interrupts in less hacky way === +
-<del>489fb47c75772e3a41ef3e988eb0c0e512592085</del>+
  
-Done, in the mainline: +==== Linux 5.6 ====
-<code> +
-2d1c645 xtensa: dispatch medium-priority interrupts +
-895666a xtensa: disable IRQs while IRQ handler is running +
-</code> +
-=== Interrupt management === +
-Done, in the mainline: +
-<code> +
-2206d5d 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: +  * exception vectors can be attached to the rest of the kernel or placed at specific address. 
-<code> + 
-2f6ea6a xtensa: display s32c1i feature flag in cpuinfo +==== Linux 5.5 ==== 
-733536b xtensa: save and restore scompare1 SR on kernel entry + 
-c622b29 xtensa: initialize atomctl SR +  * eXecute In Place (XIP) kernel. 
-28570e8 xtensa: add trap_set_handler function + 
-0027312 xtensa: add s32c1i sanity check +==== Linux 5.4 ==== 
-219b1e4 xtensa: add s32c1i-based atomic ops implementations + 
-e5a9f6a xtensa: add s32c1i-based bitops implementations +  * support for call0 ABI userspace. 
-71872b5 xtensa: add s32c1i-based spinlock implementations + 
-599bf77 xtensa: fix mb and wmb definitions +==== Linux 5.3 ==== 
-</code> + 
-=== Generic kernel_thread & friends === +  * 'virt' board (sim with PCI, corresponding board model available in QEMU since v4.2). 
-Done, in the mainline: + 
-<code> +==== Linux 5.2 ==== 
-3306a72 xtensa: switch to generic kernel_thread() + 
-f0a1bf0 xtensa: switch to generic kernel_execve() +  * support for cores with exclusive access option. 
-dc241f2 xtensa: switch to generic sys_execve() +  * basic support for cores with MPU. 
-</code> + 
-=== Support for Tensilica FPGA boards (xtfpga) === +==== Linux 5.1 ==== 
-  * [+] serial + 
-  * [+] ethernet +  * generic spinlock/rwlock. 
-  * [+] FLASH + 
-  * [-] audio +==== Linux 5.0 ==== 
-In the mainline: + 
-<code> +  * memtest. 
-0d456ba xtensa: add support for the XTFPGA boards +  * Jump labels. 
-5584b4d xtensa: add XTFPGA DTS +  * tracehook. 
-</code> +  * syscall tracepoints. 
-=== Device trees support === +  * multiple coprocessor fixes. 
-Done, in the mainline: +  * SMP fixes. 
-<code> + 
-da844a8 xtensa: add device trees support +==== Linux 4.16 ==== 
-</code> + 
-=== MMU v3 === +  * KASAN. 
-Done, in the mainline: +  * SSP. 
-<code> +  * allocation of DMA buffers from high memory. 
-e85e335 xtensa: add MMU v3 support +  * support DMA_ATTR_NO_KERNEL_MAPPING. 
-93e294a xtensa: document MMUv3 setup sequence +  * kernel is built with -mtext-section-literals and -mno-serialize-volatile. 
-</code>+ 
 +==== 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.
  
etc/users/jcmvbkbc/linux-xtensa.1653026262.txt.gz · Last modified: 2022/05/20 08:57 by jcmvbkbc