BIOS: Flashboot without main ram #55
Closed
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Modified flashboot() to skip copy to main ram if there is no main ram, and instead execute in place out of SPI flash. (For this to work the linker .ld will also need to redirect references to be inside the SPI flash mapping.)
|
For clarity: "it compiles" for Elbert v2, but not run yet (as need to get gateware building first). Actually run on Mimas v2 / Arty A7.
python $(which MimasV2Config.py) /dev/ttyACM0 build/mimasv2_base_lm32//image-gateware+bios+micropython.bin **************************************** * Numato Lab Mimas V2 Configuration Tool * **************************************** Micron M25P16 SPI Flash detected Loading file build/mimasv2_base_lm32//image-gateware+bios+micropython.bin... Erasing flash sectors... Writing to flash 100% complete... Verifying flash contents... Flash verification successful... Booting FPGA... Done. (LX P=mimasv2 F=micropython R=numato-elbert-v2) ewen@parthenon:/src/fpga-minicon f/litex-buildenv$ make firmware-connect flterm --port=/dev/ttyACM0 --speed=19200 [FLTERM] Starting... >>> >>> >>> >>> >>> >>> LiteX SoC BIOS (lm32) (c) Copyright 2012-2018 Enjoy-Digital (c) Copyright 2007-2018 M-Labs Limited Built Jan 19 2018 13:51:56 BIOS CRC passed (713b9a43) Initializing SDRAM... Memtest OK Booting from serial... Press Q or ESC to abort boot completely. sL5DdSMmkekro Timeout Booting from flash... Loading 167960 bytes from flash... Executing booted program at 0x40000000 MicroPython v1.8.7-465-g7a4245d on 2018-01-19; litex with lm32 >>> |
|
@ewen-naos-nz Can you try this with a MimasV2 config without DDR? |
|
Closing as #57 is being tested by @rohitk-singh on the cmod-a7 board. |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Modified flashboot() to skip copy to main ram if there is no main ram, and instead execute in place out of SPI flash. Needed to support, eg, Numato Elbert v2 which has no external SDRAM (only FPGA internal SRAM). Untested on Numato Elbert v2 (still working on getting gateware building for Spartan 3A), but compiles for Numato Mimas v2 / Digilent Arty A7; both will still serialboot, and Mimas v2 also appears to still flashboot.