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diff --git a/doc/README.mpc8349itx b/doc/README.mpc8349itx new file mode 100644 index 0000000..4ae03ae --- /dev/null +++ b/doc/README.mpc8349itx @@ -0,0 +1,187 @@ +Freescale MPC8349E-mITX and MPC8349E-mITX-GP Boards +--------------------------------------------------- + +1. Board Description + + The MPC8349E-mITX and MPC8349E-mITX-GP are reference boards featuring + the Freescale MPC8349E processor in a Mini-ITX form factor. + + The MPC8349E-mITX-GP is an MPC8349E-mITX with the following differences: + + A) One 8MB on-board flash EEPROM chip, instead of two. + B) No SATA controller + C) No Compact Flash slot + D) No Mini-PCI slot + E) No Vitesse 7385 5-port Ethernet switch + F) No 4-port USB Type-A interface + +2. Board Switches and Jumpers + +2.0 Descriptions for all of the board jumpers can be found in the User + Guide. Of particular interest to U-Boot developers is jumper J22: + + Pos. Name Default Description + ----------------------------------------------------------------------- + A LGPL0 ON (0) HRCW source, bit 0 + B LGPL1 ON (0) HRCW source, bit 1 + C LGPL3 ON (0) HRCW source, bit 2 + D LGPL5 OFF (1) PCI_SYNC_OUT frequency + E BOOT1 ON (0) Flash EEPROM boot device + F PCI_M66EN ON (0) PCI 66MHz enable + G I2C-WP ON (0) I2C EEPROM write protection + H F_WP OFF (1) Flash EEPROM write protection + + Jumper J22.E is only for the ITX, and it decides the configuration + of the flash chips. If J22.E is ON (i.e. jumpered), then flash chip + U4 is located at address FE000000 and flash chip U7 is at FE800000. + If J22.E is OFF, then U7 is at FE000000 and U4 is at FE800000. + + For U-Boot development, J22.E can be used to switch back-and-forth + between two U-Boot images. + +3. Memory Map + +3.1. The memory map should look pretty much like this: + + 0x0000_0000 - 0x0FFF_FFFF DDR SDRAM (256 MB) + 0x8000_0000 - 0x9FFF_FFFF PCI1 memory space (512 MB) + 0xA000_0000 - 0xBFFF_FFFF PCI2 memory space (512 MB) + 0xE000_0000 - 0xEFFF_FFFF IMMR (1 MB) + 0xE200_0000 - 0xE2FF_FFFF PCI1 I/O space (16 MB) + 0xE300_0000 - 0xE3FF_FFFF PCI2 I/O space (16 MB) + 0xF000_0000 - 0xF000_FFFF Compact Flash (ITX only) + 0xF001_0000 - 0xF001_FFFF Local bus expansion slot + 0xF800_0000 - 0xF801_FFFF Vitesse 7385 Parallel Interface (ITX only) + 0xFE00_0000 - 0xFE7F_FFFF First 8MB bank of Flash memory + 0xFE80_0000 - 0xFEFF_FFFF Second 8MB bank of Flash memory (ITX only) + +3.2 Flash EEPROM layout. + + On the ITX, jumper J22.E is used to determine which flash chips are + at which address. When J22.E is switched, addresses from FE000000 + to FE7FFFFF are swapped with addresses from FE800000 to FEFFFFFF. + + On the ITX, at the normal boot address (aka HIGHBOOT): + + FE00_0000 HRCW + FE70_0000 Alternative U-Boot image + FE80_0000 Alternative HRCW + FEF0_0000 U-Boot image + FEFF_FFFF End of flash + + On the ITX, at the low boot address (LOWBOOT) + + FE00_0000 HRCW and U-Boot image + FE04_0000 U-Boot environment variables + FE80_0000 Alternative HRCW and U-Boot image + FEFF_FFFF End of flash + + On the ITX-GP, the only option is LOWBOOT and there is only one chip + + FE00_0000 HRCW and U-Boot image + FE04_0000 U-Boot environment variables + F7FF_FFFF End of flash + +4. Definitions + +4.1 Explanation of NEW definitions in: + + include/configs/MPC8349ITX.h + + CONFIG_MPC83XX MPC83xx family + CONFIG_MPC8349 MPC8349 specific + CONFIG_MPC8349ITX MPC8349E-mITX + CONFIG_MPC8349ITXGP MPC8349E-mITX-GP + +5. Compilation + + Assuming you're using BASH shell: + + export CROSS_COMPILE=your-cross-compile-prefix + cd u-boot + make distclean + + make MPC8349ITX_config + or: + make MPC8349ITXGP_config + or: + make MPC8349ITX_LOWBOOT_config + + make + +6. Downloading and Flashing Images + +6.1 Download via tftp: + + tftp $loadaddr <uboot> + + where "<uboot>" is the path and filename, on the TFTP server, of + the U-Boot image. + +6.1 Reflash U-Boot Image using U-Boot + + setenv uboot <uboot> + run tftpflash + + where "<uboot>" is the path and filename, on the TFTP server, of + the U-Boot image. + +6.2 Using the HRCW to switch between two different U-Boot images on the ITX + + Because the ITX has 16MB of flash, it is possible to keep two U-Boot + images in flash, and use the HRCW to specify which one is to be used + when the board boots. This trick is especially effective with a + hardware debugger that can override the HRCW, such as the BDI-2000. + + When the BMS bit in the HRCW is 0, the ITX will boot the U-Boot image + at address FE000000. When the BMS bit is 1, the ITX will boot the + image at address FEF00000. + + Therefore, just put a U-Boot image at both FE000000 and FEF00000 and + change the BMS bit whenever you want to boot the other image. + + Step-by-step instructions: + + 1) Build an ITX image to be loaded at FEF00000 + + make distclean + make MPC8349ITX_config + make + + 2) Take the u-boot.bin image and flash it at FEF00000. + + tftp $loadaddr u-boot.bin + protect off all + erase FEF00000 +$filesize + cp.b $loadaddr FEF00000 $filesize + + 3) Build an ITX image to be loaded at FE000000 + + make distclean + make MPC8349ITX_LOWBOOT_config + make + + 4) Take the u-boot.bin image and flash it at FE000000. + + tftp $loadaddr u-boot.bin + protect off FE000000 +$filesize + erase FE000000 +$filesize + cp.b $loadaddr FE000000 $filesize + + The HRCW in flash is currently set to boot the image at FE000000. + + If you have a hardware debugger, configure it to set the HRCW to + B460A000 04040000 if you want to boot the image at FEF00000, or set + it to B060A000 04040000 if you want to boot the image at FE000000. + + To change the HRCW in flash to boot the image at FEF00000, use these + U-Boot commands: + + cp.b FE000000 1000 10000 ; copy 1st flash sector to 1000 + mw.b 1020 b4 8 ; modify BMS bit + protect off FE000000 +10000 + erase FE000000 +10000 + cp.b 1000 FE000000 10000 + +7. Notes + 1) The console baudrate for MPC8349EITX is 115200bps. |