From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <367A9EC8.2C191581@jlc.net> Date: Fri, 18 Dec 1998 13:28:24 -0500 From: Dan Malek MIME-Version: 1.0 To: Raphael Massin CC: linuxppc-dev@lists.linuxppc.org Subject: Re: Linux with MPC860 References: <199812161356.OAA01863@c5s144.clb> Content-Type: text/plain; charset=us-ascii Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: Raphael Massin wrote: > 1) in arch/ppc/kernel/time.c (mbx_calibrate_decr) > * the OSCM is used instead of the system clock to clock the decrementer > => no need to set bit 6 of SCCR This is incorrect. The code should force the setting of TBS in the SCCR. All of the timing in the system assumes the TBS is GCLK2/16. I have since removed the warning message and simply force the setting of this bit. This way, all MPC8xx implementations are identical and don't require any special configuration between processors or boards. > 2) in arch/ppc/boot/mbxtty.c (serial_init) > * a 48MHz source clock is used instead of a 25MHz source clock > => modify accordingly BRGC1 This is also incorrect. All of the 8xx ports have a board identification structure. At boot time, whether it is done by the board boot prom or the Linux bootloader, this should be properly initialized. One of the values in that structure is the processor clock speed and bus speed. No code should be changing in the kernel to support different clock speeds for 8xx processors. > 3) in arch/ppc/8xx_io/commproc.c (mbx_cpm_setbrg) > * idem => modify BRG_INT_CLK macro This is also because of above. This shouldn't change. > 4) in arch/ppc/8xx_io/enet.c > * CLK2 and CLK3 are used for ethern emission/reception > => modify PAPAR, PADIR and SICR > * port D, pin 12 is used to enable ethernet Correct! This is now part of the general configuration scripts so you shouldn't have to do this in the future. > These are my modifications, do you think i forgot something ? What would really help is instead of the "it crashes" statement are a System.map and register dump :-). Otherwise, there isn't much help anyone can provide. -- Dan [[ This message was sent via the linuxppc-dev mailing list. Replies are ]] [[ not forced back to the list, so be sure to Cc linuxppc-dev if your ]] [[ reply is of general interest. To unsubscribe from linuxppc-dev, send ]] [[ the message 'unsubscribe' to linuxppc-dev-request@lists.linuxppc.org ]]