Issue created by Armaan Chowfin:
https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/work_items/19
## Summary
Two issues related to memory sizing:
a. `legacy_lwipopts.h` defines a 1 MiB lwIP heap unconditionally (no opt
config options either) and the TMS570LC4357 has 512 KiB of SRAM in total. Build
fails at link stage.
b. `MEM_SIZE` sets an upper bound for total heap available to lwip during a
single run. rx chains at init alloc 10 \* 9600 byte for pbufs under
`MEMP_MEM_MALLOC` so we cannot lower the `MEM_SIZE` arbitrarily.
{width=900
height=221}
## Steps to reproduce
Run net-ping-shell rtems lwIP app:
https://gitlab.rtems.org/ar-in0/rtems-tms570-testing/-/blob/main/net-ping-shell/init.c?ref_type=heads
on TI TMS570LC4357 with a debug build of rtems-lwip and rtems.
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View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-lwip/-/work_items/19
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