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commit 1a061d9b4ecffbb3b885343fab941d240a76ff64 Author: Marco Casaroli <[email protected]> AuthorDate: Mon Aug 10 21:12:55 2026 +0200 boards/esp32s3-devkit: Add kernel_n8r2, a kernel build for 2 MB PSRAM. kernel_oct targets a WROOM-2 N32R8V: octal flash, and 8 MB of PSRAM for the page pool. The defaults size the pool for that part, with 8 pages of 64 KiB for each of the text, data and heap regions, so 1.5 MB per process. fork() duplicates the address environment, so a parent and a child need 3 MB at once and a module with 2 MB of PSRAM cannot do it. kernel_n8r2 sizes the same build for such a module. Each region is 2 pages, so a process takes 384 KiB and a fork() peaks at 768 KiB, inside a 1.5 MB pool placed at 0x80000 to leave the start of the PSRAM alone. The flash is quad and runs in DIO mode, so this configuration also exercises the CONFIG_ESP32S3_FLASH_MODE_OCT guard in kernel-space.ld from the quad side, which kernel_oct cannot. This is tight by construction. ostest has 115 KiB of text against a 128 KiB text region. A larger program needs a module with more PSRAM, not a larger pool. Verified on an ESP32-S3-DevKitC with an N8R2 module, 8 MB flash in DIO mode and 2 MB of embedded quad PSRAM. ostest reports "Parent and child had independent memory" and exits with status 0. Assisted-by: Claude Opus 5 (1M context) <[email protected]> Signed-off-by: Marco Casaroli <[email protected]> --- .../esp32s3-devkit/configs/kernel_n8r2/defconfig | 100 +++++++++++++++++++++ 1 file changed, 100 insertions(+) diff --git a/boards/xtensa/esp32s3/esp32s3-devkit/configs/kernel_n8r2/defconfig b/boards/xtensa/esp32s3/esp32s3-devkit/configs/kernel_n8r2/defconfig new file mode 100644 index 00000000000..6c53f22dd16 --- /dev/null +++ b/boards/xtensa/esp32s3/esp32s3-devkit/configs/kernel_n8r2/defconfig @@ -0,0 +1,100 @@ +# +# This file is autogenerated: PLEASE DO NOT EDIT IT. +# +# You can use "make menuconfig" to make any modifications to the installed .config file. +# You can then do "make savedefconfig" to generate a new defconfig file that includes your +# modifications. +# +# CONFIG_ARCH_LEDS is not set +# CONFIG_NSH_ARGCAT is not set +# CONFIG_NSH_CMDOPT_HEXDUMP is not set +CONFIG_ARCH="xtensa" +CONFIG_ARCH_ADDRENV=y +CONFIG_ARCH_BOARD="esp32s3-devkit" +CONFIG_ARCH_BOARD_COMMON=y +CONFIG_ARCH_BOARD_ESP32S3_DEVKIT=y +CONFIG_ARCH_CHIP="esp32s3" +CONFIG_ARCH_CHIP_ESP32S3=y +CONFIG_ARCH_CHIP_ESP32S3WROOM1N8R2=y +CONFIG_ARCH_DATA_NPAGES=2 +CONFIG_ARCH_DATA_VBASE=0x3d000000 +CONFIG_ARCH_HEAP_NPAGES=2 +CONFIG_ARCH_HEAP_VBASE=0x3d200000 +CONFIG_ARCH_INTERRUPTSTACK=2048 +CONFIG_ARCH_IRQ_TO_NDX=y +CONFIG_ARCH_KERNEL_STACKSIZE=8192 +CONFIG_ARCH_KMAP_NPAGES=2 +CONFIG_ARCH_KMAP_VBASE=0x3d400000 +CONFIG_ARCH_MINIMAL_VECTORTABLE_DYNAMIC=y +CONFIG_ARCH_NUSER_INTERRUPTS=2 +CONFIG_ARCH_PGPOOL_PBASE=0x80000 +CONFIG_ARCH_PGPOOL_SIZE=1572864 +CONFIG_ARCH_STACKDUMP=y +CONFIG_ARCH_TEXT_NPAGES=2 +CONFIG_ARCH_TEXT_VBASE=0x42c00000 +CONFIG_ARCH_USE_MMU=y +CONFIG_ARCH_XTENSA=y +CONFIG_BINFMT_ELF_EXECUTABLE=y +CONFIG_BOARD_INITTHREAD_STACKSIZE=2048 +CONFIG_BOARD_LOOPSPERMSEC=16717 +CONFIG_BUILD_KERNEL=y +CONFIG_DEBUG_BINFMT=y +CONFIG_DEBUG_BINFMT_ERROR=y +CONFIG_DEBUG_BINFMT_INFO=y +CONFIG_DEBUG_BINFMT_WARN=y +CONFIG_DEBUG_FEATURES=y +CONFIG_DEBUG_FULLOPT=y +CONFIG_DEBUG_SCHED=y +CONFIG_DEBUG_SCHED_ERROR=y +CONFIG_DEBUG_SYMBOLS=y +CONFIG_DEFAULT_TASK_STACKSIZE=8192 +CONFIG_ELF=y +CONFIG_ESP32S3_PAGEFAULT=y +CONFIG_ESP32S3_PSRAM_8M=y +CONFIG_ESP32S3_SPIFLASH=y +CONFIG_ESP32S3_SPIRAM=y +CONFIG_ESP32S3_UART0=y +CONFIG_ESP32S3_WCL=y +CONFIG_FS_PROCFS=y +CONFIG_FS_ROMFS=y +CONFIG_HAVE_CXX=y +CONFIG_HAVE_CXXINITIALIZE=y +CONFIG_HOST_MACOS=y +CONFIG_IDLETHREAD_STACKSIZE=3072 +CONFIG_INIT_FILEPATH="/system/bin/init" +CONFIG_INIT_MOUNT=y +CONFIG_INIT_MOUNT_FLAGS=0x1 +CONFIG_INIT_MOUNT_TARGET="/system/bin" +CONFIG_INTELHEX_BINARY=y +CONFIG_IRQ_WORK_STACKSIZE=2048 +CONFIG_LIBC_ENVPATH=y +CONFIG_LIBC_EXECFUNCS=y +CONFIG_LINE_MAX=64 +CONFIG_MM_PGALLOC=y +CONFIG_MM_PGSIZE=65536 +CONFIG_NSH_DISABLE_LOSMART=y +CONFIG_NSH_FILEIOSIZE=512 +CONFIG_NSH_FILE_APPS=y +CONFIG_NSH_READLINE=y +CONFIG_PATH_INITIAL="/system/bin" +CONFIG_PREALLOC_TIMERS=4 +CONFIG_PTHREAD_STACK_DEFAULT=2048 +CONFIG_RAM_SIZE=114688 +CONFIG_RAM_START=0x20000000 +CONFIG_RAW_BINARY=y +CONFIG_RR_INTERVAL=200 +CONFIG_SCHED_HAVE_PARENT=y +CONFIG_SCHED_LPWORK=y +CONFIG_SCHED_LPWORKSTACKSIZE=2048 +CONFIG_SCHED_WAITPID=y +CONFIG_STACK_COLORATION=y +CONFIG_START_DAY=6 +CONFIG_START_MONTH=12 +CONFIG_START_YEAR=2011 +CONFIG_SYSLOG_BUFFER=y +CONFIG_SYSTEM_NSH=y +CONFIG_SYSTEM_NSH_PROGNAME="init" +CONFIG_TESTING_GETPRIME=y +CONFIG_TESTING_OSTEST=y +CONFIG_TESTING_OSTEST_FPUTESTDISABLE=y +CONFIG_UART0_SERIAL_CONSOLE=y
