From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gabriel Paubert Date: Wed, 21 Jan 2004 18:27:25 +0100 To: Segher Boessenkool Cc: Benjamin Herrenschmidt , linas@austin.ibm.com, valvoline , linuxppc-dev list Subject: Re: Broadcom BCM94306 Message-ID: <20040121172725.GB3814@iram.es> References: <20040114161107.GM2658@adapter.n0skillz.org> <20040114181350.B40506@forte.austin.ibm.com> <70D6BF86-473D-11D8-A8C3-000A95A4DC02@kernel.crashing.org> <20040115115023.GA12001@iram.es> <20040116195406.GA25566@iram.es> <64789114-4A89-11D8-9C4D-000A95A4DC02@kernel.crashing.org> <1074549957.10585.57.camel@gaston> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Tue, Jan 20, 2004 at 07:01:15PM +0100, Segher Boessenkool wrote: > > On 19-jan-04, at 23:05, Benjamin Herrenschmidt wrote: > > > > >>The BAT thing at least is documented (and has been documented > >>_for ever_ -- see the PEM, the 970 is a 64-bit chip. Get the > >>rev 2.0 PEM from the 970 doc page). > >> > >>The large page thing is cpu specific afaik (from memory). > > > >POWER3 had BATs > > Sure, but BATs are not *required* by the 64-bit architecture. > > > Segher > > > p.s. Well actually, I went to check -- and the PEM 2.0 _does_ > define BATs for 64-bit. Let's put this under "POWER4 and > derivatives specific" as well then, until the docs get fixed :-) Indeed, sorry for the late reply, but I was really wondering how you could interpret a bit level description of the BATs and the sentences describing them as "some implementations may not have them" ;-) There are no mention of big/large/huge pages either[1], nor of instructions which may have been added for Power4/970 (I know about mfcrf) Frankly speaking the current state of the documentation is worrying me, I remember that when the PPC750 was announced, a lot of documentation was added to IBM and Motorola websites in a matter of days. Regards, Gabriel [1] well, I found some mentions of the large pages in a redbook about Power4. But that's about all. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/