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bootloader, esp32: add workaround for Tensilica erratum 572

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If zero-overhead loop buffer is enabled, under certain rare conditions
when executing a zero-overhead loop, the CPU may attempt to execute an invalid instruction. Work around by disabling the buffer.
This commit is contained in:
Ivan Grokhotkov
2018-11-01 11:30:48 +08:00
parent ac051f0afc
commit 42b6c4953d
4 changed files with 23 additions and 0 deletions
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11
components/esp32/include/xtensa/config/core.h
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@@ -1401,5 +1401,16 @@ extern const unsigned int XCJOIN(Xthal_cp_mask_,XCHAL_CP7_IDENT);
#define XCHAL_ERRATUM_497 0
#endif
/*
* Erratum 572 (releases TBD, but present in ESP32)
* Disable zero-overhead loop buffer to prevent rare illegal instruction
* exceptions while executing zero-overhead loops.
*/
#if ( XCHAL_HAVE_LOOPS && XCHAL_LOOP_BUFFER_SIZE != 0 )
#define XCHAL_ERRATUM_572 1
#else
#define XCHAL_ERRATUM_572 0
#endif
#endif /*XTENSA_CONFIG_CORE_H*/