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[bk72xx] Use USE_LIBRETINY_VARIANT_BK7231N for variant-specific RAM size

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Mirrors the split in LibreTiny's lt_mem.c: BK7231N has 192KB RAM, every
other BK72XX variant has 256KB. The previous hardcoded 0x00440000 was
correct for everything except BK7231N, where the stack-scan upper bound
sat 64KB past the chip's physical RAM end.
This commit is contained in:
J. Nick Koston
2026-04-30 12:55:38 -05:00
parent 8fc2e1e542
commit 5bd5cf1dab
1 changed files with 17 additions and 5 deletions
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esphome/components/bk72xx/crash_handler.cpp
+17 -5
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@@ -63,8 +63,8 @@ static bool s_crash_data_valid = false; // NOLINT(cppcoreguidelines-avoid-non-c
// BK72XX flash code is mapped at the chip-specific BKOFFSET_APP. Real code
// addresses always live above 0x00000000 in the flash region; SRAM ends at
// 0x00440000. We accept any address in the flash window (broad bound) and
// reject obvious non-code values.
// BK72XX_RAM_END. We accept any address in the flash window (broad bound)
// and reject obvious non-code values.
static constexpr uint32_t BK72XX_FLASH_START = 0x00010000; // BKRBL header end (~min app offset)
static constexpr uint32_t BK72XX_FLASH_END = 0x00200000; // 2MB cap (largest typical flash)
@@ -75,9 +75,21 @@ static inline bool is_code_addr(uint32_t addr) {
return addr >= BK72XX_FLASH_START && addr < BK72XX_FLASH_END;
}
// SRAM bounds for stack-scan validity. RAM = 0x00400100 to 0x00440000 (256KB).
static constexpr uint32_t BK72XX_RAM_START = 0x00400100;
static constexpr uint32_t BK72XX_RAM_END = 0x00440000;
// SRAM bounds for stack-scan validity. RAM origin is 0x00400000 across all
// BK72XX variants; the linker reserves the first 0x100 bytes for the ARM
// exception vector slots (see ORIGIN = 0x00400100 in bk7231{,n}_bsp.template.ld).
// Total RAM differs by variant: 192KB on BK7231N, 256KB on every other BK72XX.
// This split mirrors the SDK's own lt_heap_get_size() in
// libretiny/cores/beken-72xx/base/api/lt_mem.c — keep the values in sync if
// LibreTiny ever adjusts them.
static constexpr uint32_t BK72XX_RAM_BASE = 0x00400000;
#ifdef USE_LIBRETINY_VARIANT_BK7231N
static constexpr uint32_t BK72XX_RAM_SIZE = 192 * 1024;
#else
static constexpr uint32_t BK72XX_RAM_SIZE = 256 * 1024;
#endif
static constexpr uint32_t BK72XX_RAM_START = BK72XX_RAM_BASE + 0x100;
static constexpr uint32_t BK72XX_RAM_END = BK72XX_RAM_BASE + BK72XX_RAM_SIZE;
static inline bool is_valid_stack_ptr(uint32_t sp) {
return (sp & 0x3) == 0 && sp >= BK72XX_RAM_START && sp < BK72XX_RAM_END;