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diff --git a/doc/README.p2020rdb b/doc/README.p2020rdb new file mode 100644 index 0000000..8a2302f --- /dev/null +++ b/doc/README.p2020rdb @@ -0,0 +1,145 @@ +Overview +-------- +P2020RDB is a Low End Dual core platform supporting the P2020 processor +of QorIQ series. P2020 is an e500 based dual core SOC. + +Building U-boot +----------- +To build the u-boot for P2020RDB: + make P2020RDB_config + make + +NOR Flash Banks +----------- +RDB board for P2020 has two flash banks. They are both present on boot. + +Booting by default is always from the boot bank at 0xef00_0000. + +Memory Map +---------- +0xef00_0000 - 0xef7f_ffff Alernate bank 8MB +0xe800_0000 - 0xefff_ffff Boot bank 8MB + +0xef78_0000 - 0xef7f_ffff Alternate u-boot address 512KB +0xeff8_0000 - 0xefff_ffff Boot u-boot address 512KB + +Switch settings to boot from the NOR flash banks +------------------------------------------------ +SW4[8]=0 default NOR Flash bank +SW4[8]=1 Alternate NOR Flash bank + +Flashing Images +--------------- +To place a new u-boot image in the alternate flash bank and then boot +with that new image temporarily, use this: + tftp 1000000 u-boot.bin + erase ef780000 ef7fffff + cp.b 1000000 ef780000 80000 + +Now to boot from the alternate bank change the SW4[8] from 0 to 1. + +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 + +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 p2020rdb.dts > p2020rdb.dtb + +Likely, that .dts file will come from here; + + linux-2.6/arch/powerpc/boot/dts/p2020rdb.dts + +Booting Linux +------------- +Place a linux uImage in the TFTP disk area. + + tftp 1000000 uImage.p2020rdb + tftp 2000000 rootfs.ext2.gz.uboot + tftp c00000 p2020rdb.dtb + bootm 1000000 2000000 c00000 + +Implementing AMP(Asymmetric MultiProcessing) +--------------------------------------------- +1. Build kernel image for core0: + + a. $ make 85xx/p1_p2_rdb_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/p1_p2_rdb_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, asssuming 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/p2020rdb_camp_core0.dts > + /tftpboot/p2020rdb_camp_core0.dtb + +4. Create dtb for core1: + + $ dtc -I dts -O dtb -f -b 1 + arch/powerpc/boot/dts/p2020rdb_camp_core1.dts > + /tftpboot/p2020rdb_camp_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 uImage.core1 + => tftp 22000000 ramdiskfile + => tftp 20c00000 p2020rdb_camp_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 uImage.core0 + => tftp 2000000 ramdiskfile + => tftp c00000 p2020rdb_camp_core0.dtb + => bootm 1000000 2000000 c00000 + +Please note only core0 will run u-boot, core1 starts kernel directly +after "cpu release" command is issued. |