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Work around a bug I've seen on Linksys EC2T cards. For some reason,

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as yet unknown, those cards report their MAC address a byte at a time.
However, other AX88x90 cards report the MAC address a word at a time.
Add a heuristic which looks at the high order bytes of the first 6
words.  If they are all '0', assume the card is behaving like the
Linksys EC2T card.  Since the default prefix for these cards appears
to be 00:e0:98, this appears to be a safe heuristic.  While some cards
have been observed with different prefixes, they all work with this
heuristic.

I'm unsure if this is a bug in the EC2T card, or if it is a bug in the
initialization of the card.  No other OS has this heuristic (although
w/o it, the MAC address that is used works).
This commit is contained in:
Warner Losh 2005-09-06 22:55:32 +00:00
parent e10a8107c6
commit 79e277f155
1 changed files with 25 additions and 2 deletions
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27
sys/dev/ed/if_ed_pccard.c
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@ -431,9 +431,32 @@ ax88x90_geteprom(struct ed_softc *sc)
/* Get Data */
for (i = 0; i < 16; i++)
prom[i] = ed_asic_inb(sc, 0);
prom[i] = ed_asic_inw(sc, 0);
/*
* Work around a bug I've seen on Linksys EC2T cards. On
* these cards, the node address is contained in the low order
* bytes of the prom, with the upper byte being 0. On other
* cards, the bytes are packed two per word. I'm unsure why
* this is the case, and why no other open source OS has a
* similar workaround. The Linksys EC2T card is still extremely
* popular on E-Bay, fetching way more than any other 10Mbps
* only card. I might be able to test to see if prom[7] and
* prom[15] == 0x5757, since that appears to be a reliable
* test. On the EC2T cards, I get 0x0057 in prom[14,15] instead.
*/
for (i = 0; i < ETHER_ADDR_LEN; i++)
sc->enaddr[i] = prom[i];
if (prom[i] & 0xff00)
break;
if (i == ETHER_ADDR_LEN) {
for (i = 0; i < ETHER_ADDR_LEN; i++)
sc->enaddr[i] = prom[i] & 0xff;
} else {
for (i = 0; i < ETHER_ADDR_LEN; i += 2) {
sc->enaddr[i] = prom[i / 2] & 0xff;
sc->enaddr[i + 1] = (prom[i / 2] >> 8) & 0xff;
}
}
}
static int