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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug target/64953] Compiling sourcecode for STM32F103 causes USB errors with some optimization settings Date: Tue, 10 Feb 2015 18:38:00 -0000 [thread overview] Message-ID: <bug-64953-4-xTe22Xlw1D@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-64953-4@http.gcc.gnu.org/bugzilla/> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64953 Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|REOPENED |RESOLVED Resolution|--- |INVALID --- Comment #16 from Andrew Pinski <pinskia at gcc dot gnu.org> --- You need to compile with -mno-unaligned-access when compiling the firmware. This is mentioned in https://gcc.gnu.org/gcc-4.7/changes.html: On ARM, when compiling for ARMv6 (but not ARMv6-M), ARMv7-A, ARMv7-R, or ARMv7-M, the new option -munaligned-access is active by default, which for some sources generates code that accesses memory on unaligned addresses. This requires the kernel of those systems to enable such accesses (controlled by CP15 register c1, refer to ARM documentation). Alternatively, or for compatibility with kernels where unaligned accesses are not supported, all code has to be compiled with -mno-unaligned-access. Upstream Linux kernel releases have automatically and unconditionally supported unaligned accesses as emitted by GCC due to this option being active since version 2.6.28.
next prev parent reply other threads:[~2015-02-10 18:38 UTC|newest] Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-02-05 19:30 [Bug c/64953] New: " manuel.reimer at gmx dot de 2015-02-05 19:34 ` [Bug c/64953] " manuel.reimer at gmx dot de 2015-02-05 19:44 ` [Bug target/64953] " trippels at gcc dot gnu.org 2015-02-06 17:59 ` manuel.reimer at gmx dot de 2015-02-06 18:23 ` trippels at gcc dot gnu.org 2015-02-06 18:27 ` manuel.reimer at gmx dot de 2015-02-06 18:28 ` manuel.reimer at gmx dot de 2015-02-08 21:23 ` manuel.reimer at gmx dot de 2015-02-08 21:33 ` trippels at gcc dot gnu.org 2015-02-08 21:45 ` manuel.reimer at gmx dot de 2015-02-09 5:51 ` trippels at gcc dot gnu.org 2015-02-10 11:41 ` rearnsha at gcc dot gnu.org 2015-02-10 16:17 ` manuel.reimer at gmx dot de 2015-02-10 16:52 ` rearnsha at gcc dot gnu.org 2015-02-10 17:17 ` manuel.reimer at gmx dot de 2015-02-10 17:23 ` manuel.reimer at gmx dot de 2015-02-10 18:38 ` pinskia at gcc dot gnu.org [this message] 2015-02-10 19:44 ` manuel.reimer at gmx dot de 2015-02-13 8:34 ` maltsevm at gmail dot com
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