Subject: Re: i82544EI ethernet driver
To: Kate Feng <email@example.com>
From: Allen Briggs <firstname.lastname@example.org>
Date: 11/15/2004 14:32:09
On Mon, Nov 15, 2004 at 02:28:48PM -0500, Kate Feng wrote:
> I am porting it to a big-endian PowerPC. Thus,
> 1) for data buffer, I think I should add :
> sc->sc_ctrl |= CTRL_BEM;
> prio to
> /* Write the control registers. */
> CSR_WRITE(WMREG_CTRL, sc->sc_ctrl);
> 2) for the descriptor, I should keep the original
> codes htole32/le32toh, and le16toh....
> Meanwhile, I should do
> #define BYTE_ORDER BIG_ENDIAN
> Is that right ?
I would try to get it working as-is first. You should not need to
modify the driver to get it to work. Your bus_space routines for
the bus should take care of any CPU->PCI byte swapping and since
the chip is, by default, using little-endian, it will expect the
descriptors in memory to be little-endian (so you need to write
them with htole32 and friends, then read them with le32toh and
friends). Does that make sense?
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