we suggest to read the following pages before you proceed with this page
The BSP was developed for the starterkit . To use it in a product with special needs or a different basebord we suggest to define an own platform. To start with it make a copy of the platform definition and select the new platform definition
$ cd <BSPROOT> $ cp -r <BSPROOT>/configs/platform-tq-mba6x to <BSPROOT>/configs/<your-cool-platform> $ ptxdist platform <BSPROOT>/configs/<your-cool-platform>/platformconfig
To start configuring your new platform type
$ ptxdist platformconfig
The first thing to change should be the platform name. Adapt things like kernel configuration, image creation etc. to your needs.
The new system will be built under <BSPROOT>/platform-<platformname_from_platformconfig>
Please read the build system documentation howto go further. Keep in mind that custom mainboards may need changes in bootloader and device tree. Give the new bootloader config and device tree a new name to cleanly distinguish them from the starterkit mainboard configuration.
If creating BSP for a new motherboard, make sure to create new configurations for bootloaders and device tree.
PTXdist uses release tar balls for software it loads from the net. You have to work with patches, if you need to make changes to the source code. Follow the instructions of the developers section in the PTXdist manual.
Changes that are made in the build directories will be deleted, when PTXdist needs to redo a buildstep.
PTXdist needs a package for every bit you need in your root FS to guarantee reproducible builds. To add your software, files etc. you have to provide local packages. Follow the instructions of the developers section in the PTXdist manual. PTXdist provides templates as starting point for own packages. Type
$ ptxdist newpackage
to see what package templates exist.
Changing the partition scheme may affect the boot loader update capability and / or the kernel command line parameters!
Sector size = 512 Byte
| Unpartitioned area: 0x2000 sectors / 4 MiB | ||
|---|---|---|
| Start … End | Size (sectors / byte) | Contents |
| 0x0000 … 0x0000 | 0x0001 sector / 512 B | MBR |
| 0x0001 … 0x0001 | 0x0001 sector / 512 B | reserved 1) |
| 0x0002 … 0x07ff | 0x07fe sectors / 1023 KiB | u-boot |
| 0x0800 … 0x080f | 0x0010 sectors / 8 KiB | primary u-boot environment 2) |
| 0x0810 … 0x081f | 0x0010 sectors / 8 KiB | secondary u-boot environment 2) |
| 0x0820 … 0x0fff | 0x07e0 sectors / 1008 KiB | unused |
| 0x1000 … 0x17ff | 0x0800 sectors / 1 MiB | device tree blob |
| 0x1800 … 0x1fff | 0x0800 sectors / 1 MiB | unused |
| 1) for redundant Boot Support, for details see CPU reference Manual 2) redundant environment, cf. CONFIG_ENV_*_REDUND in U-Boot README |
||
| Partitioned area: 0x106000 sectors / 520+ MiB | ||
| Partition | Size | Contents |
| 1 | 4 MiB | Kernel image 1) |
| 2 | 256 MiB | root FS |
| 3 | 256 MiB | Spare, not formatted |
| 4 | —- | —- |
| 1) raw partition | ||
The partition scheme is defined using the config file config/platform-tq-mba6x/config/uboot-hd.config. The creation of the image is controlled using the PTXdist packages image-uboot-tqma6<q|s>-hd.
To create the image the genimage host tool is used. This tool is automatically selected and built. You can find the build directory under <BSPROOT>/platform-MBa6x/build-host/genimage. There is also a README file documenting how to use this tool.
Sector size = 64 KiB
| First sector | Last sector | Size (sectors) | Size (byte) | Contents |
|---|---|---|---|---|
| 0x00 | 0x07 | 0x08 sectors | 512 KiB | U-Boot 1) |
| 0x08 | 0x08 | 0x01 sector | 64 KiB | environment0 |
| 0x09 | 0x09 | 0x01 sector | 64 KiB | environment1 |
| 0x0a | 0x0a | 0x01 sector | 64 KiB | environment1 |
| 0x0b | 0x0f | 0x05 sectors | 372 KiB | devicetree |
| 0x10 | 0x70 | 0x60 sectors | 6 MiB | Kernel |
| 1) U-Boot image has to be written at address 0x400, cf. CPU Reference Manual for details | ||||
| First | Last | Size (sectors) | Size (byte) | Contents |
|---|---|---|---|---|
| 0 | 7 | 8 sectors | 512 KiB | U-Boot 1) |
| 8 | 8 | 1 sector | 64 KiB | environment0 |
| 9 | 9 | 1 sector | 64 KiB | environment1 |
| 10 | 14 | 5 sectors | 320 KiB | devicetree |
| 15 | 110 | 96 sectors | 6 MiB | Kernel |
| 1) U-Boot image has to be written at address 0x400, cf. CPU Reference Manual for details | ||||