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Comp.Arch.FPGA | Malloc on PowerPC on VirtexII pro
There are 3 messages in this thread.
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Malloc on PowerPC on VirtexII pro - Tibo - 2005-11-07 08:45:00
hi, I'm using a PPC405 on a Virtex2 pro. I try to allocate memory with malloc() function. It compiles without any problem but malloc returns NULL => no memory is allocated. I set the heap size at 0x0800 in docm. I set need_xil_malloc to false since xil_malloc seems to be used only for MicroBlaze. What's wrong ? Thanks for answer. Tibo ISE 7.1 / EDK 7.1 / SDK with no kernel______________________________
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Re: Malloc on PowerPC on VirtexII pro - Alan Nishioka - 2005-11-07 12:11:00
Tibo wrote: > I'm using a PPC405 on a Virtex2 pro. I try to allocate memory > with malloc() function. It compiles without any problem but malloc > returns NULL => no memory is allocated. I set the heap size at 0x0800 in > docm. I set need_xil_malloc to false since xil_malloc seems to be used > only for MicroBlaze. > > ISE 7.1 / EDK 7.1 / SDK with no kernel Are you using a custom linker script? The STACK_SIZE and HEAP_SIZE variables are only used by the linker script. If you add --verbose to the -Wl linker options (Applications/Compiler Options/Advanced) the linker script will be output when you compile. This is also a good way to get the default linker script to read and modify. If your memory space is contiguous, (ie. it just has a start address, followed by text, followed by data, followed by bss) you should probably just be using the default linker script. If you need to use a custom linker script you need to read the default linker script to see what it does with HEAP_SIZE, and modify your custom linker script. Alan Nishioka a...@nishioka.com______________________________
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Re: Malloc on PowerPC on VirtexII pro - Peter Ryser - 2005-11-07 12:24:00
How much memory are you trying to allocate? 0x800 is only 2KB. Instead of using heap that small it might be better to allocate static data structures anyway. - Peter Tibo wrote: > hi, > > I'm using a PPC405 on a Virtex2 pro. I try to allocate memory > with malloc() function. It compiles without any problem but malloc > returns NULL => no memory is allocated. I set the heap size at 0x0800 in > docm. I set need_xil_malloc to false since xil_malloc seems to be used > only for MicroBlaze. > > What's wrong ? > > Thanks for answer. > > Tibo > > ISE 7.1 / EDK 7.1 / SDK with no kernel