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<title>Blackfin Options - Using the GNU Compiler Collection (GCC)</title>
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<a name="Blackfin-Options"></a>
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Next: <a rel="next" accesskey="n" href="C6X-Options.html#C6X-Options">C6X Options</a>,
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Previous: <a rel="previous" accesskey="p" href="AVR-Options.html#AVR-Options">AVR Options</a>,
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<h4 class="subsection">3.17.6 Blackfin Options</h4>
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<p><a name="index-Blackfin-Options-1456"></a>
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<dl>
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<dt><code>-mcpu=</code><var>cpu</var><span class="roman">[</span><code>-</code><var>sirevision</var><span class="roman">]</span><dd><a name="index-mcpu_003d-1457"></a>Specifies the name of the target Blackfin processor. Currently, <var>cpu</var>
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can be one of ‘<samp><span class="samp">bf512</span></samp>’, ‘<samp><span class="samp">bf514</span></samp>’, ‘<samp><span class="samp">bf516</span></samp>’, ‘<samp><span class="samp">bf518</span></samp>’,
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‘<samp><span class="samp">bf522</span></samp>’, ‘<samp><span class="samp">bf523</span></samp>’, ‘<samp><span class="samp">bf524</span></samp>’, ‘<samp><span class="samp">bf525</span></samp>’, ‘<samp><span class="samp">bf526</span></samp>’,
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‘<samp><span class="samp">bf527</span></samp>’, ‘<samp><span class="samp">bf531</span></samp>’, ‘<samp><span class="samp">bf532</span></samp>’, ‘<samp><span class="samp">bf533</span></samp>’,
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‘<samp><span class="samp">bf534</span></samp>’, ‘<samp><span class="samp">bf536</span></samp>’, ‘<samp><span class="samp">bf537</span></samp>’, ‘<samp><span class="samp">bf538</span></samp>’, ‘<samp><span class="samp">bf539</span></samp>’,
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‘<samp><span class="samp">bf542</span></samp>’, ‘<samp><span class="samp">bf544</span></samp>’, ‘<samp><span class="samp">bf547</span></samp>’, ‘<samp><span class="samp">bf548</span></samp>’, ‘<samp><span class="samp">bf549</span></samp>’,
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‘<samp><span class="samp">bf542m</span></samp>’, ‘<samp><span class="samp">bf544m</span></samp>’, ‘<samp><span class="samp">bf547m</span></samp>’, ‘<samp><span class="samp">bf548m</span></samp>’, ‘<samp><span class="samp">bf549m</span></samp>’,
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‘<samp><span class="samp">bf561</span></samp>’, ‘<samp><span class="samp">bf592</span></samp>’.
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<p>The optional <var>sirevision</var> specifies the silicon revision of the target
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Blackfin processor. Any workarounds available for the targeted silicon revision
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are enabled. If <var>sirevision</var> is ‘<samp><span class="samp">none</span></samp>’, no workarounds are enabled.
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If <var>sirevision</var> is ‘<samp><span class="samp">any</span></samp>’, all workarounds for the targeted processor
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are enabled. The <code>__SILICON_REVISION__</code> macro is defined to two
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hexadecimal digits representing the major and minor numbers in the silicon
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revision. If <var>sirevision</var> is ‘<samp><span class="samp">none</span></samp>’, the <code>__SILICON_REVISION__</code>
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is not defined. If <var>sirevision</var> is ‘<samp><span class="samp">any</span></samp>’, the
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<code>__SILICON_REVISION__</code> is defined to be <code>0xffff</code>.
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If this optional <var>sirevision</var> is not used, GCC assumes the latest known
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silicon revision of the targeted Blackfin processor.
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<p>GCC defines a preprocessor macro for the specified <var>cpu</var>.
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For the ‘<samp><span class="samp">bfin-elf</span></samp>’ toolchain, this option causes the hardware BSP
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provided by libgloss to be linked in if <samp><span class="option">-msim</span></samp> is not given.
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<p>Without this option, ‘<samp><span class="samp">bf532</span></samp>’ is used as the processor by default.
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<p>Note that support for ‘<samp><span class="samp">bf561</span></samp>’ is incomplete. For ‘<samp><span class="samp">bf561</span></samp>’,
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only the preprocessor macro is defined.
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<br><dt><code>-msim</code><dd><a name="index-msim-1458"></a>Specifies that the program will be run on the simulator. This causes
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the simulator BSP provided by libgloss to be linked in. This option
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has effect only for ‘<samp><span class="samp">bfin-elf</span></samp>’ toolchain.
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Certain other options, such as <samp><span class="option">-mid-shared-library</span></samp> and
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<samp><span class="option">-mfdpic</span></samp>, imply <samp><span class="option">-msim</span></samp>.
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<br><dt><code>-momit-leaf-frame-pointer</code><dd><a name="index-momit_002dleaf_002dframe_002dpointer-1459"></a>Don't keep the frame pointer in a register for leaf functions. This
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avoids the instructions to save, set up and restore frame pointers and
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makes an extra register available in leaf functions. The option
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<samp><span class="option">-fomit-frame-pointer</span></samp> removes the frame pointer for all functions,
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which might make debugging harder.
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<br><dt><code>-mspecld-anomaly</code><dd><a name="index-mspecld_002danomaly-1460"></a>When enabled, the compiler ensures that the generated code does not
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contain speculative loads after jump instructions. If this option is used,
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<code>__WORKAROUND_SPECULATIVE_LOADS</code> is defined.
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<br><dt><code>-mno-specld-anomaly</code><dd><a name="index-mno_002dspecld_002danomaly-1461"></a>Don't generate extra code to prevent speculative loads from occurring.
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<br><dt><code>-mcsync-anomaly</code><dd><a name="index-mcsync_002danomaly-1462"></a>When enabled, the compiler ensures that the generated code does not
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contain CSYNC or SSYNC instructions too soon after conditional branches.
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If this option is used, <code>__WORKAROUND_SPECULATIVE_SYNCS</code> is defined.
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<br><dt><code>-mno-csync-anomaly</code><dd><a name="index-mno_002dcsync_002danomaly-1463"></a>Don't generate extra code to prevent CSYNC or SSYNC instructions from
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occurring too soon after a conditional branch.
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<br><dt><code>-mlow-64k</code><dd><a name="index-mlow_002d64k-1464"></a>When enabled, the compiler is free to take advantage of the knowledge that
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the entire program fits into the low 64k of memory.
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<br><dt><code>-mno-low-64k</code><dd><a name="index-mno_002dlow_002d64k-1465"></a>Assume that the program is arbitrarily large. This is the default.
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<br><dt><code>-mstack-check-l1</code><dd><a name="index-mstack_002dcheck_002dl1-1466"></a>Do stack checking using information placed into L1 scratchpad memory by the
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uClinux kernel.
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<br><dt><code>-mid-shared-library</code><dd><a name="index-mid_002dshared_002dlibrary-1467"></a>Generate code that supports shared libraries via the library ID method.
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This allows for execute in place and shared libraries in an environment
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without virtual memory management. This option implies <samp><span class="option">-fPIC</span></samp>.
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With a ‘<samp><span class="samp">bfin-elf</span></samp>’ target, this option implies <samp><span class="option">-msim</span></samp>.
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<br><dt><code>-mno-id-shared-library</code><dd><a name="index-mno_002did_002dshared_002dlibrary-1468"></a>Generate code that doesn't assume ID-based shared libraries are being used.
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This is the default.
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<br><dt><code>-mleaf-id-shared-library</code><dd><a name="index-mleaf_002did_002dshared_002dlibrary-1469"></a>Generate code that supports shared libraries via the library ID method,
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but assumes that this library or executable won't link against any other
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ID shared libraries. That allows the compiler to use faster code for jumps
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and calls.
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<br><dt><code>-mno-leaf-id-shared-library</code><dd><a name="index-mno_002dleaf_002did_002dshared_002dlibrary-1470"></a>Do not assume that the code being compiled won't link against any ID shared
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libraries. Slower code is generated for jump and call insns.
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<br><dt><code>-mshared-library-id=n</code><dd><a name="index-mshared_002dlibrary_002did-1471"></a>Specifies the identification number of the ID-based shared library being
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compiled. Specifying a value of 0 generates more compact code; specifying
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other values forces the allocation of that number to the current
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library but is no more space- or time-efficient than omitting this option.
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<br><dt><code>-msep-data</code><dd><a name="index-msep_002ddata-1472"></a>Generate code that allows the data segment to be located in a different
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area of memory from the text segment. This allows for execute in place in
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an environment without virtual memory management by eliminating relocations
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against the text section.
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<br><dt><code>-mno-sep-data</code><dd><a name="index-mno_002dsep_002ddata-1473"></a>Generate code that assumes that the data segment follows the text segment.
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This is the default.
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<br><dt><code>-mlong-calls</code><dt><code>-mno-long-calls</code><dd><a name="index-mlong_002dcalls-1474"></a><a name="index-mno_002dlong_002dcalls-1475"></a>Tells the compiler to perform function calls by first loading the
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address of the function into a register and then performing a subroutine
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call on this register. This switch is needed if the target function
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lies outside of the 24-bit addressing range of the offset-based
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version of subroutine call instruction.
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<p>This feature is not enabled by default. Specifying
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<samp><span class="option">-mno-long-calls</span></samp> restores the default behavior. Note these
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switches have no effect on how the compiler generates code to handle
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function calls via function pointers.
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<br><dt><code>-mfast-fp</code><dd><a name="index-mfast_002dfp-1476"></a>Link with the fast floating-point library. This library relaxes some of
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the IEEE floating-point standard's rules for checking inputs against
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Not-a-Number (NAN), in the interest of performance.
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<br><dt><code>-minline-plt</code><dd><a name="index-minline_002dplt-1477"></a>Enable inlining of PLT entries in function calls to functions that are
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not known to bind locally. It has no effect without <samp><span class="option">-mfdpic</span></samp>.
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<br><dt><code>-mmulticore</code><dd><a name="index-mmulticore-1478"></a>Build a standalone application for multicore Blackfin processors.
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This option causes proper start files and link scripts supporting
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multicore to be used, and defines the macro <code>__BFIN_MULTICORE</code>.
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It can only be used with <samp><span class="option">-mcpu=bf561[-</span><var>sirevision</var><span class="option">]</span></samp>.
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<p>This option can be used with <samp><span class="option">-mcorea</span></samp> or <samp><span class="option">-mcoreb</span></samp>, which
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selects the one-application-per-core programming model. Without
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<samp><span class="option">-mcorea</span></samp> or <samp><span class="option">-mcoreb</span></samp>, the single-application/dual-core
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programming model is used. In this model, the main function of Core B
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should be named as <code>coreb_main</code>.
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<p>If this option is not used, the single-core application programming
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model is used.
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<br><dt><code>-mcorea</code><dd><a name="index-mcorea-1479"></a>Build a standalone application for Core A of BF561 when using
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the one-application-per-core programming model. Proper start files
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and link scripts are used to support Core A, and the macro
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<code>__BFIN_COREA</code> is defined.
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This option can only be used in conjunction with <samp><span class="option">-mmulticore</span></samp>.
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<br><dt><code>-mcoreb</code><dd><a name="index-mcoreb-1480"></a>Build a standalone application for Core B of BF561 when using
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the one-application-per-core programming model. Proper start files
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and link scripts are used to support Core B, and the macro
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<code>__BFIN_COREB</code> is defined. When this option is used, <code>coreb_main</code>
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should be used instead of <code>main</code>.
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This option can only be used in conjunction with <samp><span class="option">-mmulticore</span></samp>.
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<br><dt><code>-msdram</code><dd><a name="index-msdram-1481"></a>Build a standalone application for SDRAM. Proper start files and
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link scripts are used to put the application into SDRAM, and the macro
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<code>__BFIN_SDRAM</code> is defined.
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The loader should initialize SDRAM before loading the application.
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<br><dt><code>-micplb</code><dd><a name="index-micplb-1482"></a>Assume that ICPLBs are enabled at run time. This has an effect on certain
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anomaly workarounds. For Linux targets, the default is to assume ICPLBs
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are enabled; for standalone applications the default is off.
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</dl>
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