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diff --git a/board/freescale/mpc8572ds/README b/board/freescale/mpc8572ds/README new file mode 100644 index 0000000..57fd2ad --- /dev/null +++ b/board/freescale/mpc8572ds/README @@ -0,0 +1,166 @@ +Overview +-------- +MPC8572DS is a high-performance computing, evaluation and development platform +supporting the mpc8572 PowerTM processor. + +Building U-boot +----------- + make MPC8572DS_config + make + +Flash Banks +----------- +MPC8572DS board has two flash banks. They are both present on boot, but their +locations can be swapped using the dip-switch SW9[1:2]. + +Booting is always from the boot bank at 0xec00_0000. + + +Memory Map +---------- + +0xe800_0000 - 0xebff_ffff Alternate bank 64MB +0xec00_0000 - 0xefff_ffff Boot bank 64MB + +0xebf8_0000 - 0xebff_ffff Alternate u-boot address 512KB +0xeff8_0000 - 0xefff_ffff Boot u-boot address 512KB + + +Flashing Images +--------------- + +To place a new u-boot image in the alternate flash bank and then reset with that + new image temporarily, use this: + + tftp 1000000 u-boot.bin + erase ebf80000 ebffffff + cp.b 1000000 ebf80000 80000 + pixis_reset altbank + + +To program the image in the boot flash bank: + + tftp 1000000 u-boot.bin + protect off all + erase eff80000 ffffffff + cp.b 1000000 eff80000 80000 + + +The pixis_reset command +----------------------- +The command - "pixis_reset", is introduced to reset mpc8572ds board +using the FPGA sequencer. When the board restarts, it has the option +of using either the current or alternate flash bank as the boot +image, with or without the watchdog timer enabled, and finally with +or without frequency changes. + +Usage is; + + pixis_reset + pixis_reset altbank + pixis_reset altbank wd + pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio> + pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio> + +Examples: + + /* reset to current bank, like "reset" command */ + pixis_reset + + /* reset board but use the to alternate flash bank */ + pixis_reset altbank + + +Using the Device Tree Source File +--------------------------------- +To create the DTB (Device Tree Binary) image file, +use a command similar to this: + + dtc -b 0 -f -I dts -O dtb mpc8572ds.dts > mpc8572ds.dtb + +Likely, that .dts file will come from here; + + linux-2.6/arch/powerpc/boot/dts/mpc8572ds.dts + + +Booting Linux +------------- + +Place a linux uImage in the TFTP disk area. + + tftp 1000000 uImage.8572 + tftp c00000 mpc8572ds.dtb + bootm 1000000 - c00000 + + +Implementing AMP(Asymmetric MultiProcessing) +------------- +1. Build kernel image for core0: + + a. $ make 85xx/mpc8572_ds_defconfig + + b. $ make menuconfig + - un-select "Processor support"->"Symetric multi-processing support" + + c. $ make uImage + + d. $ cp arch/powerpc/boot/uImage /tftpboot/uImage.core0 + +2. Build kernel image for core1: + + a. $ make 85xx/mpc8572_ds_defconfig + + b. $ make menuconfig + - Un-select "Processor support"->"Symetric multi-processing support" + - Select "Advanced setup" -> " Prompt for advanced kernel + configuration options" + - Select "Set physical address where the kernel is loaded" and + set it to 0x20000000, assuming core1 will start from 512MB. + - Select "Set custom page offset address" + - Select "Set custom kernel base address" + - Select "Set maximum low memory" + - "Exit" and save the selection. + + c. $ make uImage + + d. $ cp arch/powerpc/boot/uImage /tftpboot/uImage.core1 + +3. Create dtb for core0: + + $ dtc -I dts -O dtb -f -b 0 arch/powerpc/boot/dts/mpc8572ds_core0.dts > /tftpboot/mpc8572ds_core0.dtb + +4. Create dtb for core1: + + $ dtc -I dts -O dtb -f -b 1 arch/powerpc/boot/dts/mpc8572ds_core1.dts > /tftpboot/mpc8572ds_core1.dtb + +5. Bring up two cores separately: + + a. Power on the board, under u-boot prompt: + => setenv <serverip> + => setenv <ipaddr> + => setenv bootargs root=/dev/ram rw console=ttyS0,115200 + b. Bring up core1's kernel first: + => setenv bootm_low 0x20000000 + => setenv bootm_size 0x10000000 + => tftp 21000000 8572/uImage.core1 + => tftp 22000000 8572/ramdiskfile + => tftp 20c00000 8572/mpc8572ds_core1.dtb + => interrupts off + => bootm start 21000000 22000000 20c00000 + => bootm loados + => bootm ramdisk + => bootm fdt + => fdt boardsetup + => fdt chosen $initrd_start $initrd_end + => bootm prep + => cpu 1 release $bootm_low - $fdtaddr - + c. Bring up core0's kernel(on the same u-boot console): + => setenv bootm_low 0 + => setenv bootm_size 0x20000000 + => tftp 1000000 8572/uImage.core0 + => tftp 2000000 8572/ramdiskfile + => tftp c00000 8572/mpc8572ds_core0.dtb + => bootm 1000000 2000000 c00000 + +Please note only core0 will run u-boot, core1 starts kernel directly after +"cpu release" command is issued. |