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-rw-r--r--firmware/x300/lwip/lwippools.h24
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diff --git a/firmware/x300/lwip/lwippools.h b/firmware/x300/lwip/lwippools.h
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+++ b/firmware/x300/lwip/lwippools.h
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+#ifndef INCLUDED_LWIPPOOLS_H
+#define INCLUDED_LWIPPOOLS_H
+
+/*
+ * from comment at top of mem.c:
+ *
+ * To let mem_malloc() use pools (prevents fragmentation and is much faster than
+ * a heap but might waste some memory), define MEM_USE_POOLS to 1, define
+ * MEM_USE_CUSTOM_POOLS to 1 and create a file "lwippools.h" that includes a list
+ * of pools like this (more pools can be added between _START and _END):
+ *
+ * Define three pools with sizes 256, 512, and 1512 bytes
+ * LWIP_MALLOC_MEMPOOL_START
+ * LWIP_MALLOC_MEMPOOL(20, 256)
+ * LWIP_MALLOC_MEMPOOL(10, 512)
+ * LWIP_MALLOC_MEMPOOL(5, 1512)
+ * LWIP_MALLOC_MEMPOOL_END
+ */
+
+LWIP_MALLOC_MEMPOOL_START
+LWIP_MALLOC_MEMPOOL(2, 256)
+LWIP_MALLOC_MEMPOOL_END
+
+#endif /* INCLUDED_LWIPPOOLS_H */