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zephyr: alloc: access manifest through uncached alias - #11436
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lgirdwood merged 1 commit intoNov 12, 2026
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Use an uncached pointer when reading the firmware manifest to calculate the L3 heap start. This removes the need for explicit cache invalidation before accessing the manifest header. Signed-off-by: Piotr Hoppe <piotr.hoppe@intel.com>
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🟢 Approval recommended
No active review issues were identified for the change to access the IMR firmware manifest through its uncached alias.
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What changed in this PR
This PR addresses the PTL/ACE30 boot failure by reading the read-only IMR firmware manifest through its uncached alias, avoiding the cache invalidation that caused a StoreProhibited exception before firmware readiness.
Changes:
- Uses
sys_cache_uncached_ptr_get()to access the manifest. - Removes manifest-header cache invalidation while preserving the heap-start calculation.
| File | Description |
|---|---|
zephyr/lib/alloc.c |
Updates calc_l3_heap_start() to read the manifest through its uncached alias without cache invalidation. |
Review effort: Balanced
kv2019i
approved these changes
Nov 10, 2026
lgirdwood
approved these changes
Nov 11, 2026
abonislawski
approved these changes
Nov 12, 2026
PR 11436: test resultsRun date: 2026-11-12 15:15 UTC Tested commit: 3ae9d9914e9c0df043eb9cb87025a354e92e89cd
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Fix a PTL/ACE30 boot failure caused by invalidating the cache for the read-only IMR firmware manifest. The resulting
StoreProhibitedexception led to a triple fault before the FW ready notification.Read the manifest through its uncached alias instead, removing the unnecessary cache invalidation.
Validation
test_00_load_fw_defaultpasses on PTL ACEFS, with firmware successfully reporting FW ready .