sr at denx.de
Fri Jan 11 17:14:59 EST 2008
On Thursday 10 January 2008, Josh Boyer wrote:
> On Thu, 10 Jan 2008 13:38:12 -0500
> Sean MacLennan <smaclennan at pikatech.com> wrote:
> > What exactly does this function do?
> > /* Quiesce the MAL and EMAC(s) since PIBS/OpenBIOS don't
> > * do this for us
> > */
> > On the taco, with the 440EP, it doesn't seem to make any difference if I
> > call this or not. Since I am using u-boot, is it not needed?
> There are firmwares that do not reset the EMAC and MAL before passing
> control to the client program (Linux in our case). This can cause
> weird things to happen, like spurious interrupts or DMAs from the
> hardware overwriting kernel memory. So we quiesce the hardware really
> early on those.
> I don't believe U-Boot has that problem. If it does, it should be
> fixed :)
No, U-Boot doesn't have this problem.
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