1 Overview 2 -------- 3 The MPC8544DS system is similar to the 85xx CDS systems such 4 as the MPC8548CDS due to the similar E500 core. However, it 5 is placed on the same board as the 8641 HPCN system. 6 7 8 Flash Banks 9 ----------- 10 Like the 85xx CDS systems, the 8544 DS board has two flash banks. 11 They are both present on boot, but there locations can be swapped 12 using the dip-switch SW10, bit 2. 13 14 However, unlike the CDS systems, but similar to the 8641 HPCN 15 board, a runtime reset through the FPGA can also affect a swap 16 on the flash bank mappings for the next reset cycle. 17 18 Irrespective of the switch SW10[2], booting is always from the 19 boot bank at 0xfff8_0000. 20 21 22 Memory Map 23 ---------- 24 25 0xff80_0000 - 0xffbf_ffff Alternate bank 4MB 26 0xffc0_0000 - 0xffff_ffff Boot bank 4MB 27 28 0xffb8_0000 Alternate image start 512KB 29 0xfff8_0000 Boot image start 512KB 30 31 32 Flashing Images 33 --------------- 34 35 For example, to place a new image in the alternate flash bank 36 and then reset with that new image temporarily, use this: 37 38 tftp 1000000 u-boot.bin.8544ds 39 erase ffb80000 ffbfffff 40 cp.b 1000000 ffb80000 80000 41 pixis_reset altbank 42 43 44 To overwrite the image in the boot flash bank: 45 46 tftp 1000000 u-boot.bin.8544ds 47 protect off all 48 erase fff80000 ffffffff 49 cp.b 1000000 fff80000 80000 50 51 Other example U-Boot image and flash manipulations examples 52 can be found in the README.mpc85xxcds file as well. 53 54 55 The pixis_reset command 56 ----------------------- 57 A new command, "pixis_reset", is introduced to reset mpc8641hpcn board 58 using the FPGA sequencer. When the board restarts, it has the option 59 of using either the current or alternate flash bank as the boot 60 image, with or without the watchdog timer enabled, and finally with 61 or without frequency changes. 62 63 Usage is; 64 65 pixis_reset 66 pixis_reset altbank 67 pixis_reset altbank wd 68 pixis_reset altbank cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio> 69 pixis_reset cf <SYSCLK freq> <COREPLL ratio> <MPXPLL ratio> 70 71 Examples; 72 73 /* reset to current bank, like "reset" command */ 74 pixis_reset 75 76 /* reset board but use the to alternate flash bank */ 77 pixis_reset altbank 78 79 /* reset board, use alternate flash bank with watchdog timer enabled*/ 80 pixis_reset altbank wd 81 82 /* reset board to alternate bank with frequency changed. 83 * 40 is SYSCLK, 2.5 is COREPLL ratio, 10 is MPXPLL ratio 84 */ 85 pixis-reset altbank cf 40 2.5 10 86 87 Valid clock choices are in the 8641 Reference Manuals. 88 89 90 Using the Device Tree Source File 91 --------------------------------- 92 To create the DTB (Device Tree Binary) image file, 93 use a command similar to this: 94 95 dtc -b 0 -f -I dts -O dtb mpc8544ds.dts > mpc8544ds.dtb 96 97 Likely, that .dts file will come from here; 98 99 linux-2.6/arch/powerpc/boot/dts/mpc8544ds.dts 100 101 After placing the DTB file in your TFTP disk area, 102 you can download that dtb file using a command like: 103 104 tftp 900000 mpc8544ds.dtb 105 106 Burn it to flash if you want. 107 108 109 Booting Linux 110 ------------- 111 112 Place a linux uImage in the TFTP disk area too. 113 114 tftp 1000000 uImage.8544 115 tftp 900000 mpc8544ds.dtb 116 bootm 1000000 - 900000 117 118 Watch your ethact, netdev and bootargs U-Boot environment variables. 119 You may want to do something like this too: 120 121 setenv ethact eTSEC3 122 setenv netdev eth1 123
