Hello, I work on MPC boards with Linux 2.6.9 and I have a problem with the cpm_dpalloc function.
In the file cpm2_common.c the function "uint cpm_dpalloc(uint size, uint align)" is intended to allocate a piece of memory in the dpram. This piece of memory has at least "size" bytes and I beleived that the returned address should be aligned on "align" bytes. This function calls "void *rh_alloc(rh_info_t * info, int size, const char *owner)" from rheap.c file. In this function the alignment is only used to calculate the right size with the formula : size = (size + (info->alignment - 1)) & ~(info->alignment - 1); It seems to be right but the alignment is not used to retreive an aligned start address. So if I do the following sequential calls, I have the following results : cpm_dpalloc(16, 8) -> 0XC0 -> right aligned cpm_dpalloc(64, 64) -> 0XD0 -> wrong aligned -> must be 0x100 cpm_dpalloc(16, 8) -> 0X110 -> right aligned but wrong to use cpm_dpalloc(24, 8) -> 0X1200 -> right aligned but wrong to use I can have the wanted values if instead of size, I try to allocate (size + align - 1) bytes but I don't think it is the solution. Perhaps, I don't understand the allocation theory. Any idea ? Thanks all Laurent
