Boot hss over jtag #45
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Novakov
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A little preview of full-boot-over-jtag: Icicle board is configured in boot mode 0 with external JTAG probe attached. OpenOCD is running script that orchestrates boot process by loading HSS (this pull request) and few seconds later loads payload image. After that HSS boots other harts and u-boot is started. With Linux being loaded over TFTP it is possible to easily develop without need to swap SD cards or write to SPI flash. |
Signed-off-by: Maciej Nowak <[email protected]>
Signed-off-by: Maciej Nowak <[email protected]>
Novakov
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After a while I got back to playing with Icicle kit and I still found this PR useful., It would be nice to get some feedback on it even if it's just 'we are not interested' :) |
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This pull request adds ability to run HSS in bootmode 0 by loading it over JTAG. In order to do so small trampoline executable is built. Details of operation and usage in
jtag_trampoline/README.md.Tested on Icicle board with ARM-JTAG-TINY-OCD-H JTAG probe and upstream OpenOCD.
My goal is to provide capabilties for loading and running u-boot over JTAG without need to swap SD cards or access eMMC. Loading HSS over JTAG is first step, JTAG boot source integrated into HSS is next on my TODO list