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This function can fail if the device tree runs out of space. Rather than silently booting with an incomplete device tree, allow the failure to be detected. Unfortunately this involves changing a lot of places in the code. I have not changed behvaiour to return an error where one is not currently returned, to avoid unexpected breakage. Eventually it would be nice to allow boards to register functions to be called to update the device tree. This would avoid all the many functions to do this. However it's not clear yet if this should be done using driver model or with a linker list. This work is left for later. Signed-off-by: Simon Glass <sjg@chromium.org> Acked-by: Anatolij Gustschin <agust@denx.de> |
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| mpc8349itx.c | ||
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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.