platform: add interactive shell to Zynq-A9 QEMU#79
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Implement console I/O driver for Cadence UART and port the chat-first shell to the Zynq-A9 platform. New files: - drivers/console.c: claw_console_init/read/write for Cadence UART (UART0 at 0xE0000000, RX polling with taskYIELD) - shell.c: full chat-first REPL ported from esp_shell.c — insert-mode line editing, UTF-8, tab completion, thinking animation, AI chat Changes: - main.c: wait 10s for DHCP, then enter zynq_shell_loop() - syscalls.c: add sched_tool_remove_by_name stub (tool_sched.c is ESP-IDF only due to NVS dependency) Verified: shell prompt appears on QEMU, /help and AI chat available. Signed-off-by: Chao Liu <chao.liu.zevorn@gmail.com>
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Summary
Add chat-first interactive shell to the Zynq-A9 QEMU platform, bringing feature parity with ESP32 platforms.
Components
Console driver (
platform/zynq-a9/drivers/console.c):claw_console_read()with timeout and taskYIELD pollingclaw_console_write()via UART FIFOShell (
platform/zynq-a9/shell.c):esp_shell.cBoot sequence
Test plan
make build-zynq-a9-qemucompiles (shell + console driver)make run-zynq-a9-qemushows shell prompt<You>-nographicstdin → UART RX works/helpcommand lists available commands