[lwip-devel] [bug #26273] etharp.c : fix alignment issue in etharp_raw

[Guillaume du PONTAVICE]

Follow-up Comment #2, bug #26273 (project lwip):

well, in my case
the beginning of the ARP packet is word aligned & hdr->sipaddr & hdr->dipaddr
are two bytes aligned (not 4 bytes aligned), as their offset in an ARP packet
is only two bytes aligned.

when writing on a non aligned address on ST20 chipset, no exception occurs,
but this may result in corruption of adjacent memory.

I guess the ST compiler try to optimize the cast & then generate a load word
/ store word instruction instead of two load short / store short
instructions.
I will have a look at the assembly dump tomorrow to confirm this.

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