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Production update - #3862
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Production update#3862
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… Cortex-A New Learning Path under embedded-and-microcontrollers, with the TI AM62L EVM as the worked example: sign a Zephyr image into a FIT, build the public key into U-Boot through CONFIG_DEVICE_TREE_INCLUDES, add a boot command that starts Zephyr only after bootm verifies it, and prove it on the board with a wrong-key and a tampered image. Adds Roy Jamil to the contributors list.
…sal tests out, redo diagrams - Page 3 now uses Workbench for Zephyr in VS Code: import the AArch64 toolchain, add a Zephyr 4.4.2 workspace (Texas Instruments template), create and build the application, with annotated screenshots of each wizard and of the build. - New page 7 holds the optional tests: second image signed with key-b, tampered copy, fit_check_sign on both, and the two refusals on the board. Pages 3-6 keep only the trusted image; the production review is now page 8. - Page 1 shows a generic Cortex-A boot chain first, then the AM62L one; the diagrams use Arial and the AM62L labels match the binman packaging (BL1+TIFS, BL31+OP-TEE+SPL). - Prerequisites point at the Workbench for Zephyr Learning Path; further reading links the three Ac6 courses, and page 8 ends with a short pointer to them.
- Cut about a quarter of the prose on every page: tool-option explanations, repeated justifications and asides are gone; the reasons that prevent mistakes stay, one sentence each. - The four Workbench for Zephyr screenshots no longer show the Windows user name in paths, and the activity bar is cropped out.
- The fit_check_sign, mkimage and board-run outputs are complete again: no line is replaced by an ellipsis. - Every output block is followed by a "Lines to look for" call-out that names the lines carrying the verdict, then the explanation of those lines as it stood before the prose was lightened.
- env.sh opens with a board block (BOARD, ZEPHYR_ADDR, FIT_ADDR, BOOT_DEV, UBOOT_DEFCONFIG) and a vendor SDK block; the .its, the CONFIG_PREBOOT fragment and the make lines take their values from it. The expanded fragment is byte-identical to the former literal one. - Each page keeps a generic section first and marks the TI-specific parts (SDK install, card image, boot switches, console, binman make variables) as AM62L EVM sections. HS-FS and HS-SE are TI's names for the development and production security states, given once on the first page. - The porting section on the last page is a checklist that maps onto the env.sh blocks. - Review fixes: the ROM/partition claims are no longer stated for every Cortex-A SoC; any key passes in the development state; the wrong-key mkimage output is shown in full; timestamps agree across pages.
- The boot log, the trusted boot and the two refusals on pages 6 and 7 now reproduce what the EVM printed (Tera Term recording of 11 September): TF-A and SPL lines, the U-Boot banner with SoC AM62LX SR1.1 HS-FS, the real read times and FIT timestamp, and Zephyr's second-core line. - The demo-only echo lines of the recording are replaced by the echo the Learning Path's own boot command prints. - Page 8 quotes the same banner line.
…boxes - The range brackets in both diagrams now open downwards, towards the boxes they group, and start and end exactly on those boxes' edges; the blue bracket no longer starts in the gap before the Zephyr box. - Bracket labels are centred on their bracket and no wider than it. - The generic diagram names who checks each box under that box, as the AM62L one does, instead of under the gaps between boxes. - The grey labels say what TI's documentation says: before the key is fused, any key passes.
- The prerequisites link the extension's Visual Studio Marketplace page. - The setup page links both, in the same sentence form as the published Workbench for Zephyr Learning Path. - The Zephyr build page links the Workbench for Zephyr site where the walkthrough starts.
- About 30% less prose; every command and output a reader runs or checks is still there. - Each idea is explained once: the security states on the production page, the required-signature rule on the boot chain page, the fail-closed && chain on the U-Boot page. - The boot switch section keeps the SW3 setting; the full pincount setting is a link in the troubleshooting list. - env.sh carries a comment per board value instead of two paragraphs. - Removed the branch-byte check, which the header magic check covers, the mkimage -l tip and a duplicate signature-node block.
The Learning Path needed a board. It now runs on the TI AM62L EVM or in QEMU, as one generic story with tabs where the two targets differ. - page 1 gains a comparison table and tabs the target-specific chain - page 2 writes env-am62l.sh or env-qemu.sh and takes the U-Boot source from the TI SDK or from the U-Boot project - pages 4 and 5 use UBOOT_CC, and page 5 tabs how the key reaches the control device tree: CONFIG_DEVICE_TREE_INCLUDES on the EVM, a dumped QEMU device tree merged with signature.dtsi and passed with EXT_DTB - 6-boot-the-board.md becomes 6-boot-the-target.md, "Boot the target": the vendor card image or a 64 MiB disk image, the board or QEMU - page 7 uses BOOT_IMG, so its commands are identical on both targets - the Add Application screenshot gains a QEMU call-out Page 8 drops the "what you've proved" framing: a Summary section says what U-Boot checks with key-a and what the stages below it accept, the boot-path audit table is gone, and the closing section says what to change next instead of listing courses. The FIT signature diagram loses its failure-modes box, which repeated messages the test page already shows. The QEMU track was run end to end with unpatched U-Boot 2025.07: trusted boot, wrong-key refusal and tampered-image refusal.
Every page now presents QEMU first and the AM62L EVM as the same work on hardware: the comparison table, all nine tab blocks, the environment lines, the prerequisites and the board lists. Where an output block is the board's, the text now says so, and page 3 warns that the Workbench screenshots were captured with the EVM selected. Also corrects the name of TI's tool: the AM62L uses Keywriter Lite.
…xt-to-text-updates
…xt-to-text-updates
…xt-to-text-updates
add video link minor readbility improvements
Tech review of Boot a signed Zephyr image with U-Boot
Fix LP issues
Technical reivew of OMM introduction
20 more summaries and faqs for servers and cloud computing
Tech review of ROS2 with Device Connect
…nd-gaming Swin2sr VGF LP review
Kedify LP review
…-text-updates Add Llama ONNX GenAI validated path to text-to-text Android LP
Review nested virtualization Learning Path
…ocontrollers Zephyr UBoot Cortex-A LP review
spelling and link checks
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