From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 5 Dec 2002 12:50:58 -0700 From: Matt Porter To: Linux on PowerPC Developers Mail List Subject: Re: questions about porting an 8240 arch to linux Message-ID: <20021205125058.B14807@home.com> References: <20021205161437.A16705@crystal.2d3d.co.za> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20021205161437.A16705@crystal.2d3d.co.za>; from abraham@2d3d.co.za on Thu, Dec 05, 2002 at 04:14:37PM +0200 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Thu, Dec 05, 2002 at 04:14:37PM +0200, Abraham vd Merwe wrote: > * Board based on Motorola MPC8240 processor (based on 603e core) > * 32M sdram > * 250mhz processor > * board is based on PowerPC microprocessor command hardware reference > platform (CHRP). > > !!! Here's what I figured out/did so far. Please correct me if I did > something wrong. > > 1. used 2.4.18 w/ 2.4.18-ppc patch applied (got it from ftp.kernel.org) > 2. added my arch to arch/ppc/config.in > 3. added a embed_config() section to arch/ppc/boot/simple/embed_config.c for > my arch with the following hardcoded parameters: This is wrong. You don't need this if you use misc-simple.c > 4. add an include for my arch header in include/asm-ppc/mpc8xx.h You are an 8240/603e core. don't touch. > 5. defined the following bd_t structure in my arch header: Not needed. > 6. defined IMAP_ADDR, IMAP_SIZE, NR_8259_INTS in my arch header Not needed. > 2. what uart should I use? the user manual claims the board has a 8250 > compatible uart, but if I compile in the standard linux 16550 uart support, > it exports the same symbols as those in arch/ppc/boot/simple/m8xx_tty.c > which is compiled when I select M8XX support. I disabled the 16550 support > for now and defined NR_8259_INTS to 16 (what should this be?) for now just > to get it to compile. As benh said, select 6xx/7xx/74xx/... (classic ppc) > 3. do I need to setup any registers before branching to the kernel? No, the simple bootloader takes care of it for you. See platforms/* for examples to make your life easy. menf1_setup.c:menf1_find_end_of_memory(): get memory size using standard mpc10x lib. menf1_setup.c:menf1_platform_init(): setup todc_* to use rtc to handle bus freqs. If no RTC on system then see: zx4500_setup.c:zx4500_calibrate_decr(): setup jiffies. Take a good look at mpc10x_common.c. Good luck. Regards, -- Matt Porter porter@cox.net This is Linux Country. On a quiet night, you can hear Windows reboot. ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/