[lwip-devel] [bug #26133] Processor specific porting needs flexibility in terms of placement of various memory pools.

[Srinivas Gollakota]

Follow-up Comment #4, bug #26133 (project lwip):

>Ideally this should be an optional feature, so the existing 
>behaviour is the default (as that is what most will want) and >those that
need it could specify something like #define >LWIP_MEMP_EXTERNALLY_ALLOCATED 1
(just a suggestion for the >name) in lwipopts.h

Sure,This would be an optional feature for those who want to have finer
control on the placement rather than compiler chosen one.

One way is as below.

#ifdef LWIP_MEMP_EXTERNALLY_ALLOCATED
static u8_t* memp_memory;
u8_t** lwip_memp_ptr = &memp_memory;
u32_t  lwip_memp_len = xxx; // length of the memp memory
#else
 // default
#endif 

and init routine will set the pointer to appropriate location
*lwip_memp_ptr = xxx;


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