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[libretiny] Enable MEMP_MEM_MALLOC=1 on BK72XX for dynamic MEMP pools

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Allocate all MEMP pools (TCP PCBs, UDP PCBs, netconns, TCP segments,
pbufs, etc.) from the heap on demand instead of pre-allocated static
arrays. Saves ~20KB RAM on BK7231N (87,312 B free vs 67,144 B before).

Safe because the BK WiFi driver's receive path runs in task context
(core_thread pops from g_wifi_core.io_queue), not ISR context.
ESP32 and ESP8266 both ship with MEMP_MEM_MALLOC=1.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
J. Nick Koston
2026-02-21 16:19:18 -06:00
parent 770e3092a5
commit 30d694e62e
1 changed files with 14 additions and 3 deletions
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17
esphome/components/libretiny/__init__.py
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@@ -291,6 +291,8 @@ def _configure_lwip(config: dict) -> None:
────────────────────────────────────────────────────────────────────────────
TCP_SND_BUF 2×MSS 4×MSS 10×MSS 5×MSS 7×MSS 4×MSS
TCP_WND 4×MSS 4×MSS 10×MSS 2×MSS 3×MSS 4×MSS
MEM_LIBC_MALLOC 1 1 0 0 1 1 BK
MEMP_MEM_MALLOC 1 1 0 0 0 1 BK
MEM_SIZE N/A* N/A* 16/32KB 5KB N/A* N/A* BK
PBUF_POOL_SIZE 10 16 3/10 20 20 10 BK
MAX_SOCKETS_TCP 5 16 12 —** —** dynamic
@@ -303,7 +305,8 @@ def _configure_lwip(config: dict) -> None:
MEMP_NUM_NETBUF 0 2 16 2***** 8 4
MEMP_NUM_TCPIP_MSG_INPKT 4 8 16 8***** 12 8
* ESP32 and LN882H use MEM_LIBC_MALLOC=1 (system heap, no dedicated pool).
* ESP8266/ESP32/LN882H use MEM_LIBC_MALLOC=1 (system heap, no dedicated pool).
ESP8266/ESP32 also use MEMP_MEM_MALLOC=1 (MEMP pools from heap, not static).
** RTL/LN SDKs don't define MAX_SOCKETS_TCP/UDP (LibreTiny-specific).
*** BK LT overlay: MAX_SOCKETS_UDP+2+1 = 25.
**** RTL/LN LT overlay overrides to flat 7.
@@ -372,13 +375,21 @@ def _configure_lwip(config: dict) -> None:
# - MEM_LIBC_MALLOC=1: Use system heap instead of dedicated lwIP heap.
# BK SDK defaults to a 16/32KB dedicated pool (MEM_LIBC_MALLOC=0).
# LN882H already uses MEM_LIBC_MALLOC=1. This eliminates the dedicated
# pool bottleneck that caused OTA slowness at MEM_SIZE=5KB.
# pool bottleneck that caused OTA slowness due to heap fragmentation.
# Safe because BK SDK wires mem_clib_malloc → os_malloc → pvPortMalloc
# (FreeRTOS thread-safe heap).
# - MEMP_MEM_MALLOC=1: Allocate MEMP pools from heap on demand instead
# of static arrays. Saves ~20KB RAM for unused pool entries. Safe because
# the BK WiFi driver's receive path runs in task context (core_thread),
# not ISR context — the ISR only posts to a queue. ESP32 and ESP8266
# both ship with MEMP_MEM_MALLOC=1.
# - PBUF_POOL_SIZE: BK SDK "reduced plan" sets this to only 3 — too few
# for multiple concurrent connections (API + web_server + OTA).
# BK default plan uses 10; match that. RTL(20) and LN(20) need no override.
# Cost: 10 × 1580 = 15.8KB static RAM (vs 3 × 1580 = 4.7KB before).
# With MEMP_MEM_MALLOC=1, this is a max count (allocated on demand).
if CORE.is_bk72xx:
lwip_opts.append("MEM_LIBC_MALLOC=1")
lwip_opts.append("MEMP_MEM_MALLOC=1")
lwip_opts.append("PBUF_POOL_SIZE=10")
cg.add_platformio_option("custom_options.lwip", lwip_opts)