Booting linux on ESP32

anonymous@undisclosed.example.com (Anonymous) — Wed, 24 May 2023 03:59:21 +0000

Booting linux on ESP32 See Booting linux on ESP32s3 for an updated version with userspace. Sources: * * * buildroot mainline $ cd examples/get-started/linux_boot $ idf.py build $ idf.py -p /dev/ttyUSB0 flash $ parttool.py -p /dev/ttyUSB0 write_partition --partition-name linux --input xip-esp32-esp32/arch/xtensa/boot/xipImage $ parttool.py -p /dev/ttyUSB0 write_partition -…

Booting linux on ESP32s3

anonymous@undisclosed.example.com (Anonymous) — Sun, 09 Jun 2024 05:06:28 +0000

Booting linux on ESP32s3 Sources: * * * * * * *

Booting wifi-enabled linux on ESP32s3

anonymous@undisclosed.example.com (Anonymous) — Tue, 19 Sep 2023 11:43:11 +0000

Booting wifi-enabled linux on ESP32s3 Script that builds and flashes everything: What can be done after booting: Joining open network # ip link set espsta0 up # iw dev espsta0 connect # udhcpc -i espsta0 Joining WPA2 network # ip link set espsta0 up # cat > /tmp/ws.conf <

Issues

anonymous@undisclosed.example.com (Anonymous) — Mon, 08 Aug 2016 20:53:36 +0000

Issues * multihit_exception -- fixed * signal_delivery_scheduling_atomic_tif_flags_checking_on_kernel_exit -- fixed * strange_tlb_values_on_smp -- fixed * intercore_ccount_synchronization

Patch/pull request check list

anonymous@undisclosed.example.com (Anonymous) — Wed, 05 Feb 2020 09:03:22 +0000

Patch/pull request check list Does it build for * allmodconfig * MMUv2/MMUv3, CONFIG_MMU on/off * all platforms (xtfpga, iss, xt2000) * CONFIG_OF on/off * CONFIG_HIGHMEM on/off * CONFIG_SMP on/off * CONFIG_MODULES on/off * cache aliasing core

Patch review check list

anonymous@undisclosed.example.com (Anonymous) — Mon, 08 Aug 2016 20:53:14 +0000

Patch review check list * If it has inline asm * Does it use specific instructions, does it correctly handle cores w/o such instructions * Does it correctly specify argument constraints (e.g. earlyclobber (=&) arguments) * Does it use possibly reserved registers (e.g. a7 with CONFIG_FRAME_POINTER)

Rootfs notes

anonymous@undisclosed.example.com (Anonymous) — Thu, 16 Mar 2023 22:56:23 +0000

Rootfs notes Rootfs in FLASH (UBIFS) The easiest way to generate UBIFS image is by setting BR2_TARGET_ROOTFS_UBIFS to y in the buildroot config. Buildroot will also need the following file system parameters, that can be queried with mtdinfo tool:

etc:users:jcmvbkbc:linux-xtensa:signal_delivery_scheduling_atomic_tif_flags_checking_on_kernel_exit

anonymous@undisclosed.example.com (Anonymous) — Mon, 08 Aug 2016 20:53:14 +0000

msgctl06 1 FAIL : msgctl(msqid, IPC_STAT, &buf) failed errno = 22 [ 246.090000] BUG: sleeping function called from invalid context at /home/dumb/ws/tensilica/linux/linux/include/linux/freezer.h:46 [ 246.090000] in_atomic(): 0, irqs_disabled(): 1, pid: 1996, name: msgctl07 [ 246.090000] Stack: d5f93d90 d5f93d70 00000004 3fa9a8f4 d5f93d70 00000004 00000006 00000018 9001720d d5f93db0 00060403 00000001 00000001 000007cc d4c12900 3fa9a8f4 900030d0 d5f93dd0 d4c60504 d4c60000 000…

etc:users:jcmvbkbc:linux-xtensa:strange_tlb_values_on_smp

anonymous@undisclosed.example.com (Anonymous) — Mon, 08 Aug 2016 20:53:14 +0000

update_mmu_cache is used to update TLB entries after do_pagefault. It used invalidate_itlb_mapping(addr); invalidate_dtlb_mapping(addr); to invalidate TLB entry that appeared with the fault. This works with single CPU, but in SMP case update_mmu_cache may be called on a CPU different from that that took the exception. Without TLB sanity debugging this leads to looping over the instruction that caused initial pagefault until the wrong TLB entry is kicked out. With TLB sanity deb…

XIP kernel

anonymous@undisclosed.example.com (Anonymous) — Thu, 06 Feb 2020 23:09:33 +0000

XIP kernel cat <(head -c 96M /dev/zero) builds/xip-nommu-kc705-de212/arch/xtensa/boot/xipImage /dev/zero | head -c 128M > xip-nommu-kc705-de212.image # or with CRAMFS rootfs: cat <(head -c 96M <(cat /home/jcmvbkbc/ws/tensilica/buildroot/build-xtensa-nommu-de108/images/rootfs.cramfs /dev/zero ) ) \ builds/xip-nommu-kc705-de212/arch/xtensa/boot/xipImage /dev/zero | head -c 128M > xip-nommu-kc705-de212.image qemu/qemu-system-xtensa -cpu de212 -M kc705-nommu -nographic -monitor none -serial…

Open Source & Linux Lab etc:users:jcmvbkbc:linux-xtensa

Booting linux on ESP32

Booting linux on ESP32s3

Booting wifi-enabled linux on ESP32s3

Issues

Patch/pull request check list

Patch review check list

Rootfs notes

etc:users:jcmvbkbc:linux-xtensa:signal_delivery_scheduling_atomic_tif_flags_checking_on_kernel_exit

etc:users:jcmvbkbc:linux-xtensa:strange_tlb_values_on_smp

XIP kernel