FelipeMdeO opened a new pull request, #19483:
URL: https://github.com/apache/nuttx/pull/19483
## Summary
Adds a new `stm32f746g-disco:dropbear` board config providing an interactive
NSH shell over SSH on the board's on-board Ethernet, following the same
pattern as `sim:dropbear` and `esp32c3-devkit:dropbear`.
The password file and Dropbear's ECDSA host key are persisted on the board's
on-board Micron N25Q QSPI NOR flash (mounted as LittleFS at `/data`) instead
of RAM, so provisioned users and the host key survive a reset.
Two issues were found and fixed along the way:
- NXFFS does not implement `rename()`, which broke Dropbear's host key
generation (write `.tmp` + rename). Added a LittleFS mount option to the
N25Q QSPI driver, mirroring the existing toggle already used by the
sibling `stm32_w25q.c` driver.
## Impact
New board config, one driver enhancement (backwards compatible, gated by
Kconfig), and documentation. No changes to existing configs.
`make savedefconfig` round-trips clean against the committed defconfig.
## Testing
Build host: Ubuntu Linux x86_64, GCC (arm-none-eabi 13.2.1)
Target: `stm32f746g-disco:dropbear`, real hardware (STM32F746G-DISCO,
on-board ST-LINK/V2-1, Ethernet cable to a router)
Clean boot, host key generated and persisted on the LittleFS partition:
```
nsh> mount
/data type littlefs
/proc type procfs
nsh> ls /data
/data:
.
..
dropbear_ecdsa_host_key
```
`useradd` and the resulting persisted passwd file:
```
nsh> useradd felipe Testpass123
nsh> cat /data/passwd
felipe:wXj576zZRWsI+fOfkq1P9C:0:0:/
```
Interactive SSH session (password auth) over the board's DHCP address.
```
[email protected]'s password:
Authenticated to 192.168.15.155 (192.168.15.155:2222) using "password".
nsh> ls
/:
dev/
proc/
tmp/
var/
nsh> ps
TID PID PPID PRI POLICY TYPE NPX STATE EVENT ...
5 4 3 100 RR Task - Running ...
```
Reboot persistence (the point of moving off tmpfs) — board reset, no
`useradd` re-run, same user/password still works:
```
nsh> cat /data/passwd
felipe:wXj576zZRWsI+fOfkq1P9C:0:0:/
```
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