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builder: don't count non-writable SHT_NOBITS sections as RAM/bss

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A SHT_NOBITS section was unconditionally treated as .bss (RAM) unless it
was the stack. The ESP linker scripts emit non-writable SHT_NOBITS
sections (.irom_dummy / .rodata_dummy) that merely reserve the
flash-mapped XIP virtual address ranges and occupy no RAM. Counting them
inflated the reported bss/RAM usage.

Signed-off-by: deadprogram <ron@hybridgroup.com>
This commit is contained in:
deadprogram
2026-06-28 20:16:29 +02:00
committed by Ron Evans
parent 10224a4bf8
commit 9111927f85
1 changed files with 8 additions and 2 deletions
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builder/sizes.go
+8 -2
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@@ -501,8 +501,9 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
Align: section.Addralign,
Type: memoryStack,
})
} else {
// Regular .bss section.
} else if section.Flags&elf.SHF_WRITE != 0 {
// Regular .bss section. Zero-initialized RAM is always
// writable, so require SHF_WRITE here.
sections = append(sections, memorySection{
Address: section.Addr,
Size: section.Size,
@@ -510,6 +511,11 @@ func loadProgramSize(path string, packagePathMap map[string]string) (*programSiz
Type: memoryBSS,
})
}
// Other (non-writable) SHT_NOBITS sections are address-space
// placeholders that occupy no RAM, such as the ESP linker
// script's .irom_dummy / .rodata_dummy sections which reserve
// the flash-mapped XIP virtual address ranges. They must not be
// counted as bss/RAM usage.
} else if section.Type == elf.SHT_PROGBITS && section.Flags&elf.SHF_EXECINSTR != 0 {
// .text
sections = append(sections, memorySection{