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AVR port: Improve description of thread_shell() location on ATmegas with 2 byte program counters.

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Kelvin Lawson
2010-02-21 16:12:31 +00:00
parent 19a3c524ee
commit 0fd53909b0
1 changed files with 4 additions and 3 deletions
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7
ports/avr/atomport.c
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@@ -190,9 +190,10 @@ void archThreadContextInit (ATOM_TCB *tcb_ptr, void *stack_top, void (*entry_poi
* Devices with 3 byte program counters (e.g. Atmega25x, Xmega)
* must have 3 bytes stacked for the entry point. In GCC
* function pointers are still 16-bits, however, so we cannot
* actually pass entry points at > 64KB in memory space. This
* means that the thread_shell() function must be located
* in the bottom 64KB. You may need to modify linker scripts to
* actually pass entry points at > 64K in instruction space
* (128KB in real terms) and just set the top byte to zero here.
* This means that the thread_shell() function must be located
* in the bottom 128KB. You may need to modify linker scripts to
* force this.
*/
#ifdef __AVR_3_BYTE_PC__