However, you are wrong about the TX buffers being on the heap. The
buffer is inside the at91_eth_priv_t structure. This is allocated at
the end of if_at91.c. It will be placed in the data segment.
at91_eth_priv structure is contains only RX buffers, RX buffer descriptors
and "TX buffer descriptors". No contains "TX buffers".
at91_eth_send() shows " priv->tbd[priv->curr_tbd_idx].addr = sg_list[i].buf;
" - no memory copy, only address assigment.
But, sg_list[] it is mbuf, dynamically allocated in TCP/IP stack.
Present at91_eth driver is don't use static TX buffers.
Ivan.
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