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diff --git a/board/Barix/ipam390/README.ipam390 b/board/Barix/ipam390/README.ipam390 new file mode 100644 index 0000000..2d155a3 --- /dev/null +++ b/board/Barix/ipam390/README.ipam390 @@ -0,0 +1,229 @@ +Summary +======= +The README is for the boot procedure on the ipam390 board + +In the context of U-Boot, the board is booted in three stages. The initial +bootloader which executes upon reset is the ROM Boot Loader (RBL) and sits +in the internal ROM. The RBL initializes the internal memory and then +depending on the exact board and pin configurations will initialize another +controller (such as NAND) to continue the boot process by loading +the secondary program loader (SPL). The SPL will initialize the system +further (some clocks, SDRAM). As on this board is used the falcon boot +mode, now 2 ways are possible depending on the GPIO 7_14 input pin, +connected with the "soft reset switch" + +If this pin is logical 1 (high level): +spl code starts the kernel image without delay + +If this pin is logical 0 (low level): +spl code starts the u-boot image + +AIS is an image format defined by TI for the images that are to be loaded +to memory by the RBL. The image is divided into a series of sections and +the image's entry point is specified. Each section comes with meta data +like the target address the section is to be copied to and the size of the +section, which is used by the RBL to load the image. At the end of the +image the RBL jumps to the image entry point. The AIS format allows for +other things such as programming the clocks and SDRAM if the header is +programmed for it. We do not take advantage of this and instead use SPL as +it allows for additional flexibility (run-time detect of board revision, +loading the next image from a different media, etc). + +Compilation +=========== +run "./MAKEALL ipam390" in the u-boot source tree. +Once this build completes you will have a u-boot.ais file that needs to +be written to the nand flash. + +Flashing the images to NAND +========================== +The AIS image can be written to NAND flash using the following commands. +Assuming that the network is configured and enabled and the u-boot.ais file +is tftp'able. + +U-Boot > print upd_uboot +upd_uboot=tftp c0000000 ${u-boot};nand erase.part u-boot;nand write c0000000 20000 ${filesize} +U-Boot > +U-Boot > run upd_uboot +Using DaVinci-EMAC device +TFTP from server 192.168.1.1; our IP address is 192.168.20.71 +Filename '/tftpboot/ipam390/u-boot.ais'. +Load address: 0xc0000000 +Loading: ################################## + 1.5 MiB/s +done +Bytes transferred = 493716 (78894 hex) + +NAND erase.part: device 0 offset 0x20000, size 0x160000 +Erasing at 0x160000 -- 100% complete. +OK + +NAND write: device 0 offset 0x20000, size 0x78894 + 493716 bytes written: OK +U-Boot > + +Recovery +======== + +In the case of a "bricked" board, you need to use the TI tools found +here[1] to create an uboot-uart-ais.bin file + +- cd to the u-boot source tree + +- compile the u-boot for the ipam390 board: +$ ./MAKEALL ipam390 + + -> Now we shall have u-boot.bin + +- Create u-boot-uart-ais.bin +$ mono HexAIS_OMAP-L138.exe -entrypoint 0xC1080000 -ini +ipam390-ais-uart.cfg -o ./uboot-uart-ais.bin ./u-boot.bin@0xC1080000; + +Note: The ipam390-ais-uart.cfg is found in the board directory +for the ipam390 board, u-boot:/board/Barix/ipam390/ipam390-ais-uart.cfg + +- We can now run bootloader on IPAM390 via UART using the command below: + +$ mono ./slh_OMAP-L138.exe -waitForDevice -v -p /dev/tty.UC-232AC uboot-uart-ais.bin +NOTE: Do not cancel the command execution! The command takes 20+ seconds +to upload u-boot over serial and run it! +Outcome: +Waiting for the OMAP-L138... +(AIS Parse): Read magic word 0x41504954. +(AIS Parse): Waiting for BOOTME... (power on or reset target now) +(AIS Parse): BOOTME received! +(AIS Parse): Performing Start-Word Sync... +(AIS Parse): Performing Ping Opcode Sync... +(AIS Parse): Processing command 0: 0x5853590D. +(AIS Parse): Performing Opcode Sync... +(AIS Parse): Executing function... +(AIS Parse): Processing command 1: 0x5853590D. +(AIS Parse): Performing Opcode Sync... +(AIS Parse): Executing function... +(AIS Parse): Processing command 2: 0x5853590D. +(AIS Parse): Performing Opcode Sync... +(AIS Parse): Executing function... +(AIS Parse): Processing command 3: 0x5853590D. +(AIS Parse): Performing Opcode Sync... +(AIS Parse): Executing function... +(AIS Parse): Processing command 4: 0x5853590D. +(AIS Parse): Performing Opcode Sync... +(AIS Parse): Executing function... +(AIS Parse): Processing command 5: 0x58535901. +(AIS Parse): Performing Opcode Sync... +(AIS Parse): Loading section... +(AIS Parse): Loaded 326516-Byte section to address 0xC1080000. +(AIS Parse): Processing command 6: 0x58535906. +(AIS Parse): Performing Opcode Sync... +(AIS Parse): Performing jump and close... +(AIS Parse): AIS complete. Jump to address 0xC1080000. +(AIS Parse): Waiting for DONE... +(AIS Parse): Boot completed successfully. + +Operation completed successfully. + +Falcon Bootmode (boot linux without booting U-Boot) +=================================================== + +The Falcon Mode extends this way allowing to start the Linux kernel directly +from SPL. A new command is added to U-Boot to prepare the parameters that SPL +must pass to the kernel, using ATAGS or Device Tree. + +In normal mode, these parameters are generated each time before +loading the kernel, passing to Linux the address in memory where +the parameters can be read. +With Falcon Mode, this snapshot can be saved into persistent storage and SPL is +informed to load it before running the kernel. + +To boot the kernel, these steps under a Falcon-aware U-Boot are required: + +1. Boot the board into U-Boot. +Use the "spl export" command to generate the kernel parameters area or the DT. +U-Boot runs as when it boots the kernel, but stops before passing the control +to the kernel. + +Here the command sequence for the ipam390 board: +- load the linux kernel image into ram: + +U-Boot > nand read c0100000 2 200000 400000 + +NAND read: device 0 offset 0x200000, size 0x400000 + 4194304 bytes read: OK + +- generate the bootparms image: + +U-Boot > spl export atags c0100000 +## Booting kernel from Legacy Image at c0100000 ... + Image Name: Linux-3.5.1 + Image Type: ARM Linux Kernel Image (uncompressed) + Data Size: 2504280 Bytes = 2.4 MiB + Load Address: c0008000 + Entry Point: c0008000 + Verifying Checksum ... OK + Loading Kernel Image ... OK +subcommand not supported +subcommand not supported +Argument image is now in RAM at: 0xc0000100 + +- copy the bootparms image into nand: + +U-Boot > mtdparts + +device nand0 <davinci_nand.0>, # parts = 6 + #: name size offset mask_flags + 0: u-boot-env 0x00020000 0x00000000 0 + 1: u-boot 0x00160000 0x00020000 0 + 2: bootparms 0x00020000 0x00180000 0 + 3: factory-info 0x00060000 0x001a0000 0 + 4: kernel 0x00400000 0x00200000 0 + 5: rootfs 0x07a00000 0x00600000 0 + +active partition: nand0,0 - (u-boot-env) 0x00020000 @ 0x00000000 + +defaults: +mtdids : nand0=davinci_nand.0 +mtdparts: mtdparts=davinci_nand.0:128k(u-boot-env),1408k(u-boot),128k(bootparms),384k(factory-info),4M(kernel),-(rootfs) +U-Boot > nand erase.part bootparms + +NAND erase.part: device 0 offset 0x180000, size 0x20000 +Erasing at 0x180000 -- 100% complete. +OK +U-Boot > nand write c0000100 180000 20000 + +NAND write: device 0 offset 0x180000, size 0x20000 + 131072 bytes written: OK +U-Boot > + +You can use also the predefined U-Boot Environment variable "setbootparms", +which will do all the above steps in one command: + +U-Boot > print setbootparms +setbootparms=nand read c0100000 200000 400000;spl export atags c0100000;nand erase.part bootparms;nand write c0000100 180000 20000 +U-Boot > run setbootparms + +NAND read: device 0 offset 0x200000, size 0x400000 + 4194304 bytes read: OK +## Booting kernel from Legacy Image at c0100000 ... + Image Name: Linux-3.5.1 + Image Type: ARM Linux Kernel Image (uncompressed) + Data Size: 2504280 Bytes = 2.4 MiB + Load Address: c0008000 + Entry Point: c0008000 + Verifying Checksum ... OK + Loading Kernel Image ... OK +subcommand not supported +subcommand not supported +Argument image is now in RAM at: 0xc0000100 + +NAND erase.part: device 0 offset 0x180000, size 0x20000 +Erasing at 0x180000 -- 100% complete. +OK + +NAND write: device 0 offset 0x180000, size 0x20000 + 131072 bytes written: OK +U-Boot > + +Links +===== +[1] + http://sourceforge.net/projects/dvflashutils/files/OMAP-L138/ |