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wscript: cap kernel RAM on snowy_emery and spalding_gabbro to match real [FIRM-1270] #792

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Merged
jplexer merged 1 commit into from
Feb 6, 2026
+7 −1
Merged

wscript: cap kernel RAM on snowy_emery and spalding_gabbro to match real [FIRM-1270] #792

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8 changes: 7 additions & 1 deletion src/fw/wscript
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,7 @@ def _generate_memory_layout(bld):
ldscript_template = bld.path.find_node('stm32f7xx_flash_fw.ld.template')
elif bld.is_silk():
ldscript_template = bld.path.find_node('stm32f412_flash_fw.ld.template')
elif bld.env.BOARD == 'snowy_emery':
elif bld.env.BOARD in ('snowy_emery', 'spalding_gabbro'):
ldscript_template = bld.path.find_node('stm32f439_snowy_emery_flash_fw.ld.template')
elif bld.is_snowy_compatible():
ldscript_template = bld.path.find_node('stm32f439_flash_fw.ld.template')
Expand Down Expand Up @@ -336,6 +336,12 @@ def _generate_memory_layout(bld):
worker_ram_size = 12 * 1024 # The worker always gets 12k of RAM.
worker_ram = (ram_end - app_ram_size - worker_ram_size, worker_ram_size)
kernel_ram_size = total_ram[1] - app_ram_size - worker_ram_size
# On snowy_emery the excess RAM results in a kernel heap far larger than real
# hardware (~131K vs ~106K), which is further capped by the heap allocator's
# 15-bit segment size field to 131068 bytes. Reduce kernel RAM to match real
# hardware heap pressure and avoid masking memory-related bugs in QEMU.
if bld.env.BOARD in ('snowy_emery', 'spalding_gabbro'):
kernel_ram_size = min(kernel_ram_size, 172 * 1024)
kernel_ram = (total_ram[0], kernel_ram_size)

# As a basic sanity check, make sure we're giving the kernel at least 64k.
Expand Down
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