To enable SD interface in SPI boot on P1025RDB: 1. Perform the following updates in u-boot a) Modify pmuxcr to enable SD bus in case of SPI boot b) Update the corresponding static mux implementation in u-boot 2. Perform the following updates in Linux a) Disable IFC from device tree and kernel defconfig
The patch details to enable SD interface are given below. A zip file, AN4336SW.zip, containing the patches for u-boot and Linux accompanies this application note. The file can be downloaded from [1].
U-Boot
- Extract the u-boot code from the QorIQ SDK 1.0.1 iso
- Apply the patch, u-boot-p1025rdb-enabling-sd-in-spi-boot.patch
- Compile the u-boot using "make" command for SPI Flash
make ARCH=powerpc CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.5.55-eglibc-2.11.55/powerpc-linux-gnu/bin/powerpc-linux-gnu- p1025RDB_SPIFLASH
- Use the boot_format utility to generate the spiimage. For more information, see SDK manual.
- Update the SPI Flash with the above built spiimage
Linux
- Extract the Linux source code from QorIQ SDK 1.0.1 iso
- Apply the patch, linux-p1025rdb-enabling-sd-in-spi-boot.patch
- Compile Linux using make command
#make ARCH=powerpc CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.5.55-eglibc-2.11.55/powerpc-linux-gnu/bin/powerpc-linux-gnuarch/ powerpc/configs/qoriq_sdk_nonsmp_defconfig #make ARCH=powerpc CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.5.55-eglibc-2.11.55/powerpc-linux-gnu/bin/powerpc-linux-gnu-
./sripts/dtc/dtc -f -I dts -O dtb -R 8 -S 0x3000 arc/powerpc/boot/dts/p1025rdb.dts.dts > p1025rdb.dtb.dtb
- With the updated SPI bootloader, Linux uImage and p1025rdb.dtb, the user must be able to enable SD interface on p1025RDB.
NOTE
- The above-mentioned changes must be done only when the user specifically requires the SD interface using SPI boot.
- For all other boot methods, these patches must not be used.
