mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-30 08:31:03 +00:00
bc2d40ca10
In the earlier patches, the SPL/TPL fraamework was introduced. For SD/SPI flash booting way, we introduce the SPL to enable a loader stub. The SPL was loaded by the code from the internal on-chip ROM. The SPL initializes the DDR according to the SPD and loads the final uboot image into DDR, then jump to the DDR to begin execution. For NAND booting way, the nand SPL has size limitation on some board(e.g. P1010RDB), it can not be more than 4KB, we can call it "minimal SPL", So the dynamic DDR driver doesn't fit into this minimum SPL. We added the TPL that is loaded by the the minimal SPL. The TPL initializes the DDR according to the SPD and loads the final uboot image into DDR,then jump to the DDR to begin execution. This patch enabled SPL/TPL for P1_P2_RDB to support starting from NAND/SD/SPI flash with SPL framework and initializing the DDR according to SPD in the SPL/TPL. Because the minimal SPL load the TPL to L2 SRAM and the jump to the L2 SRAM to execute, so the section .resetvec is no longer needed. Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com> Reviewed-by: York Sun <yorksun@freescale.com> |
||
|---|---|---|
| .. | ||
| ddr.c | ||
| law.c | ||
| Makefile | ||
| p1_p2_rdb.c | ||
| pci.c | ||
| README | ||
| spl.c | ||
| spl_minimal.c | ||
| tlb.c | ||
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 Alternate bank 8MB 0xe800_0000 - 0xefff_ffff Boot bank 8MB 0xef74_0000 - 0xef7f_ffff Alternate u-boot address 768KB 0xeff4_0000 - 0xefff_ffff Boot u-boot address 768KB 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 ef740000 ef7fffff cp.b 1000000 ef740000 c0000 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 eff40000 ffffffff cp.b 1000000 eff40000 c0000 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, 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/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.