Eero Nurkkala 3b330089d5 mpfs: ddr: add DDR training ... This adds DDR training. The training has a small chance of failing, and then the training is restarted. DDR training cannot be done meaningfully while the software is in DDR. If the system is intended to run from eNVM, like a bootloader, the linker script should be tuned to utilize the envm region as follows: envm (rx) : ORIGIN = 0x20220100, LENGTH = 128K - 256 l2lim (rwx) : ORIGIN = 0x08000000, LENGTH = 1024k 256 bytes are reserved for the system; The fixed block may be installed from the 'hart-software-services' -repository: https://github.com/polarfire-soc/hart-software-services.git For example, the 256-byte image: hss-envm-wrapper-bm1-dummySbic.bin may be prepended on the nuttx bootloader image in the following manner: cat hss-envm-wrapper-bm1-dummySbic.bin > nuttx_bootloader.bin cat nuttx.bin >> nuttx_bootloader.bin riscv64-unknown-elf-objcopy -I binary -O ihex --change-section-lma *+0x20220000 nuttx_bootloader.bin flashable_image.hex This provides an image 'flashable_image.hex' that may be flashed on the eNVM region via Microsemi Libero tool. Signed-off-by: Eero Nurkkala <eero.nurkkala@offcode.fi>		2021-10-21 22:40:26 -05:00
..
icicle	mpfs: ddr: add DDR training	2021-10-21 22:40:26 -05:00