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Add RAMFUNC linker section #39

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Add RAMFUNC linker section #39

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11 changes: 11 additions & 0 deletions linker_scripts/gcc/lpc8xx_common.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -72,6 +72,17 @@ SECTIONS
{
. = ALIGN(4);
_sdata = .;
/*
* Functions tagged for RAM execution (FastLED's FL_RAMFUNC ->
* __attribute__((section(".ramfunc"))), enabled with -DFASTLED_M0_RAMFUNC).
* Collected into .data so they get a FLASH load address (AT(_etext)) and a
* RAM run address, and are copied to RAM by the existing _sdata.._edata loop
* in Reset_Handler -- no startup change needed. Executing from the 0-wait
* SRAM (instead of wait-stated flash) is what lets the cycle-counted M0
* clockless WS2812 bit timing hit sub-microsecond pulses on the LPC845.
*/
*(.ramfunc*)
. = ALIGN(4);
*(.data*)
. = ALIGN(4);
_edata = .;
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