arch/arm/rp23xx: add text heap (up_textheap_memalign) support#19256
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ricardgb wants to merge 1 commit into
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arch/arm/rp23xx: add text heap (up_textheap_memalign) support#19256ricardgb wants to merge 1 commit into
ricardgb wants to merge 1 commit into
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Implement the text-heap allocator for the RP2350 so that relocatable code (loadable modules, code buffers) can be placed in executable RAM. The RP2350 Cortex-M33 executes from SRAM and NuttX runs it with the MPU disabled, so the text heap is backed directly by the kernel heap (kmm_memalign / kmm_free / kmm_heapmember); no separate executable region or up_textheap_data_address() alias is required. Selected via ARCH_HAVE_TEXT_HEAP on ARCH_CHIP_RP23XX and compiled when CONFIG_ARCH_USE_TEXT_HEAP is set (off by default). Developed with Claude Code (Anthropic's agentic coding tool) and exercised on a Raspberry Pi Pico 2 W by loading and running a Thumb code image from the text heap. Signed-off-by: Ricard Rosson <ricard@groundbits.com> Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Arch: arm
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| void *up_textheap_memalign(size_t align, size_t size) | ||
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| return kmm_memalign(align, size); |
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if text heap is same as kernel heap, why need select ARCH_HAVE_TEXT_HEAP?
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linguini1
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Jul 4, 2026
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Waiting for consensus about fully generated PRs.
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Summary
Adds the text-heap allocator for the RP2350 (rp23xx), enabling relocatable/loadable code to be placed in executable RAM (
up_textheap_memalign/up_textheap_free/up_textheap_heapmember). The RP2350 Cortex-M33 executes from SRAM and NuttX runs it with the MPU disabled, so the text heap is backed directly by the kernel heap (kmm_*); no separate executable region orup_textheap_data_address()alias is required.Selected via
ARCH_HAVE_TEXT_HEAPonARCH_CHIP_RP23XX; compiled whenCONFIG_ARCH_USE_TEXT_HEAPis set (off by default).Impact
arch/arm/src/rp23xx/rp23xx_textheap.c.arch/arm/Kconfig: RP23XX selectsARCH_HAVE_TEXT_HEAP.Make.defs/CMakeLists.txt: compile the file underCONFIG_ARCH_USE_TEXT_HEAP. No change when the option is off.Testing
raspberrypi-pico-2:nsh+CONFIG_ARCH_USE_TEXT_HEAP=ycompiles cleanly;nxstyleclean.🤖 Generated with Claude Code