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fix(esp_system): fixes build failure with XIP PSRAM + BSS/NoInit in external memory

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Declare ext_ram_xip_seg as a distinct region overlapping drom_seg at the
same origin (the esp32s3/c5/c61/h4 pattern) instead of aliasing drom_seg,
so .ext_ram.dummy has its own location counter and .ext_ram.bss reclaims
the VMA space of NOLOAD rodata (.rodata_wlog_*), saving up to one MMU
page of PSRAM on esp32s31. No layout change on esp32p4.

Closes https://github.com/espressif/esp-idf/issues/18791
Related https://github.com/espressif/esp-idf/issues/14992
This commit is contained in:
Mahavir Jain
2026-07-22 16:34:48 +05:30
parent cadfa9c096
commit 22cc8d41c8
3 changed files with 27 additions and 2 deletions
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11
components/esp_system/ld/esp32p4/memory.ld.in
View File

@@ -163,6 +163,15 @@ MEMORY
/* PSRAM seg */
extern_ram_seg(RWX) : org = 0x48000000, len = IDROM_SEG_SIZE
#if CONFIG_SPIRAM_XIP_FROM_PSRAM
/**
* Distinct region overlapping `drom_seg` at the same origin, so `.ext_ram.dummy`
* gets its own location counter and `.ext_ram.bss` can reclaim the space of
* NOLOAD rodata (e.g. `.rodata_wlog_*`).
*/
ext_ram_xip_seg(RWX) : org = 0x48000020, len = IDROM_SEG_SIZE - 0x20
#endif // CONFIG_SPIRAM_XIP_FROM_PSRAM
}
/* Heap ends at top of dram0_0_seg */
@@ -212,7 +221,7 @@ REGION_ALIAS("rtc_reserved_seg", lp_reserved_seg );
#endif // CONFIG_APP_BUILD_USE_FLASH_SECTIONS
#if CONFIG_SPIRAM_XIP_FROM_PSRAM
REGION_ALIAS("ext_ram_seg", drom_seg);
REGION_ALIAS("ext_ram_seg", ext_ram_xip_seg);
#else
REGION_ALIAS("ext_ram_seg", extern_ram_seg);
#endif //#if CONFIG_SPIRAM_XIP_FROM_PSRAM

11
components/esp_system/ld/esp32s31/memory.ld.in
View File

@@ -85,6 +85,15 @@ MEMORY
/* PSRAM seg */
extern_ram_seg(RWX) : org = 0x50000000, len = IDROM_SEG_SIZE
#if CONFIG_SPIRAM_XIP_FROM_PSRAM
/**
* Distinct region overlapping `drom_seg` at the same origin, so `.ext_ram.dummy`
* gets its own location counter and `.ext_ram.bss` can reclaim the space of
* NOLOAD rodata (e.g. `.rodata_wlog_*`).
*/
ext_ram_xip_seg(RWX) : org = 0x50000020, len = IDROM_SEG_SIZE - 0x20
#endif // CONFIG_SPIRAM_XIP_FROM_PSRAM
}
/* Heap ends at top of dram0_0_seg */
@@ -114,7 +123,7 @@ REGION_ALIAS("rtc_reserved_seg", lp_reserved_seg);
#endif // CONFIG_APP_BUILD_USE_FLASH_SECTIONS
#if CONFIG_SPIRAM_XIP_FROM_PSRAM
REGION_ALIAS("ext_ram_seg", drom_seg);
REGION_ALIAS("ext_ram_seg", ext_ram_xip_seg);
#else
REGION_ALIAS("ext_ram_seg", extern_ram_seg);
#endif //#if CONFIG_SPIRAM_XIP_FROM_PSRAM

7
components/esp_system/ld/ld.ext_ram.sections
View File

@@ -9,6 +9,13 @@
.ext_ram.dummy (NOLOAD) :
{
HIDDEN(_ext_ram_on_same_bus = ORIGIN(ext_ram_seg) == ORIGIN(flash_rodata_seg));
/**
* This must be the first section placed in `ext_ram_seg`, and `ext_ram_seg` must be
* a distinct region (not a REGION_ALIAS of `flash_rodata_seg`) so it has its own
* location counter. Otherwise NOLOAD rodata (e.g. .rodata_wlog_*) placed after
* `_rodata_reserved_end` leaves the counter past the skip target, and moving it
* backwards here is a hard linker error.
*/
. = _ext_ram_on_same_bus ? ORIGIN(ext_ram_seg) + (_rodata_reserved_end - _flash_rodata_dummy_start) : 0;
. = ALIGN(_ext_ram_on_same_bus ? _esp_mmu_page_size : 0);
} > ext_ram_seg