From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3E8A4EE1.8090205@mvista.com> Date: Tue, 01 Apr 2003 20:45:53 -0600 From: Mark Hatle MIME-Version: 1.0 To: Dmytro Bablinyuk Cc: linuxppc-embedded@lists.linuxppc.org Subject: Re: Linux support for MPC859T processor References: <3E8A4B70.7090607@tait.co.nz> In-Reply-To: <3E8A4B70.7090607@tait.co.nz> Content-Type: text/plain; charset=us-ascii; format=flowed Sender: owner-linuxppc-embedded@lists.linuxppc.org List-Id: On userspace basis.. the 860 and the 859 are fully compatable.. The need for 859T changes may be in the kernel. So anyone who sells/supports an 860 based system can support your needs for application level. (That includes MontaVista.) The linux kernel of course is a different level of complexity. --Mark Dmytro Bablinyuk wrote: > > We are trying to find a linux supplier who supports Motorola MPC859T > processor (actually it will be processor from Motorola but our custom > board). > We have contacted MontaVista and we discovered that the nearest > processor they support is MPC860. > Also we discovered that: > > An MPC860 based board might be suitable for initial S/W development > purposes as the chip is very similar to the MPC859T we intend to use. > There are 7 variants of the '860 with different cache sizes and serial > communications capabilities. > The main differences between the '860 and the '859T that I am aware of are: > > 1. The '860 runs at approximately half the speed of the '859T. > 2. The clocking generator for the 860 would require a different > configuration to the the '859 as a consequence of above. > 3. The '860 has an internal RTC function whereas the '859T does not. > 4. The '859T has a dedicated 10/100Mbps ethernet MAC whereas the '860 > has to use the serial communication controllers for ethernet operations. > The available ethernet speeds depend on the particular variant of the '860. > Note some of the '860 variants include a dedicated 10/100Mbps ethernet MAC. > 5. The '859T core operates off a lower voltage (1.8V) for power > saving whereas the '860 core runs off a 3.3V supply. > Consequently the '860 draws approximately 2x the power of the '859T. > > Apart from the differing core voltages the '860 and '859T appear to be > pin compatible > > * Could somebody please give me an advice on how much S/W work might be > involved in the future to port linux from '860 to '859T based on 1-5 > (see above) > > * Can you suggest (based on above) any of 7 variants of the '860 > > Thank you > > > > > ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/