Kontron KTT20-pITX - Manual (Page 23)

KTD-S0045-D Page 19 Bootloader Modification and Download
KTT20/pITX Software Guide
5 Bootloader Modification and Download
If you want to create your own bootloader and load it into the SPI TM flash device you must execute several
steps or you use the KONTRON Windows ® Image Creator. The KONTRON tool generates a special image file
which can be downloaded with NVIDIAs ® NVFLASH tool into the RAM. Thereafter one part of the image
executes a script and program the bootloader into the SPI TM flash device.
ATTENTION
It is impossible to use another boot device as the SPI
TM
flash
(e.g. the NAND flash) because the boot device is hardcoded.
The image file includes three modules:
S
One special U-Boot version with a script (named SPI-FLASHER)
S
One Binary Configuration Table (BCT), content definition by NVIDIA ®
S
One custom bootloader for the SPI TM flash device
The first component represents an unchangeable U-Boot version. Do not replace this module with another
program.
The Binary Configuration Table is realized as an ASCII file for special usage of the KONTRON Image Creator
which contains several parameters for SPI
TM flash and SDRAM configuration. An extract:
Version=0x00020001;
BlockSize=0x00008000;
PageSize=0x00000800;
PartitionSize=0x01000000;
DevType[0]=NvBootDevType_Spi;
DeviceParam[0].SpiFlashParams.ReadCommandTypeFast=0;
DeviceParam[0].SpiFlashParams.ClockDivider=12;
DeviceParam[0].SpiFlashParams.ClockSource=NvBootSpiClockSource_PllPOut0;
SDRAM[0].MemoryType=NvBootMemoryType_Ddr2;
SDRAM[0].PllMChargePumpSetupControl=0x00000008;
..............
SDRAM[0].ApbMiscGpXm2CompPadCtrl=0x01f1f008;
SDRAM[0].ApbMiscGpXm2VttGenPadCtrl=0x07076600;
BootLoader=u-boot.bin,0x00108000,0x00108000,Complete;
There are some important restrictions:
S
Do not change any SPI TM or SDRAM parameter (forbidden areas marked with red color)
S
Do not use a character, bring all inputs together without a clearance
S
Do not use comments