feat(ttl): Set fan speed in Script A, archive job logs to USB in C

config.ttl gains FAN_SPEED (30). Script A rebinds the two max31790
controllers (18-0020, 25-0020) and applies the speed with
fan-speed-control.sh, answering its confirmation prompt, so a run starts
from a known thermal state rather than whatever the last test left.

Script A also clears /host/hw-eval/current/jobs before the run, and
Script C copies that directory to /mnt/usb/jobs-<date>_<time> so the
bgctl job logs leave the DUT with the run they belong to.

Fix: 25-0020 was bound twice in a row -- the second bind can only fail,
since the driver is already attached. Removed; the two controllers now
have a matching unbind/sleep/bind each.

Script A -> V1.0.7, history covering the config.ttl and Script C changes
as well.

Docs: fan control and the job-log archive added to Tech Stack, Key
Features and Data Flow; the config.ttl example refreshed with FAN_SPEED
and the SWB_UNIT flags. Three risks recorded in Future Extensions --
`rm` without -r cannot clear the job subdirectories that Script C copies
with -r, the fan confirmation wait has no timeout and would hang
silently if the prompt ever changes, and /mnt/usb is never checked for
being mounted.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014RetWKFZFG1ZHcitQAyhwM

src/Script_ABC_Blanton/1_Blanton_Script_A.ttl

@@ -37,6 +37,10 @@
 ;                       ScriptA, utils/setup_pmon.ttl                   Add TPM
 ;                       ScriptAC                                        NVME Error Info
 ;                       ScriptAC                                        Add PCIe Summary
+;   V1.0.7  2026-08-25  config.ttl                                      Add FAN_SPEED
+;                       ScriptA                                         Add Fan Ctrl (max31790 rebind + fan-speed-control.sh)
+;                       ScriptA                                         Clear /host/hw-eval/current/jobs before the run
+;                       ScriptC                                         Copy stress jobs log to USB, timestamped
 ; =============================================================================
 include "config.ttl"
 
@@ -71,6 +75,10 @@ gettime timestr
 sprintf2 cmd 'sudo date -s "%s %s"' datestr timestr
 sendln cmd
 
+;Stress log clear
+wait prompt_sonic_root
+sendln "rm /host/hw-eval/current/jobs/*"
+
 ; ========== HW Test Session ==========
 wait prompt_sonic_root
 sendln "hw-test-session start"
@@ -79,8 +87,29 @@ sendln "hw-test-session log"
 wait prompt_sonic_root
 sendln "hw-test-session status"
 
-; ========== Wait DUT Init ==========
+; ========== FAN SPEED ==========
 wait prompt_sonic_root
+sendln "echo 18-0020 > /sys/bus/i2c/drivers/max31790/unbind"
+wait prompt_sonic_root
+sendln "sleep .5"
+wait prompt_sonic_root
+sendln "echo 18-0020 > /sys/bus/i2c/drivers/max31790/bind"
+wait prompt_sonic_root
+sendln "echo 25-0020 > /sys/bus/i2c/drivers/max31790/unbind"
+wait prompt_sonic_root
+sendln "sleep .5"
+wait prompt_sonic_root
+sendln "echo 25-0020 > /sys/bus/i2c/drivers/max31790/bind"
+
+wait prompt_sonic_root
+sprintf2 fan_ctrl_cmd 'fan-speed-control.sh %d' FAN_SPEED
+sendln fan_ctrl_cmd
+
+wait "Set all configured fan channels to"
+sendln "y"
+
+
+; ========== Wait DUT Init ==========
 include "utils/wait_init.ttl"
 
 ; ========== DUT Info ==========

src/Script_ABC_Blanton/3_Blanton_Script_C.ttl

@@ -102,6 +102,14 @@ sendln "show reboot-cause"
 wait prompt_sonic_root
 sendln "show uptime"
 
+; ========== Copy Stress Log to USB ==========
+getdate ts_date "%Y%m%d"
+gettime ts_time "%H%M"
+sprintf2 usb_dst "/mnt/usb/jobs-%s_%s" ts_date ts_time
+sprintf2 cmd "cp -r /host/hw-eval/current/jobs/ %s" usb_dst
+wait prompt_sonic_root
+sendln cmd
+
 ; ========== HW Test Session ==========
 wait prompt_sonic_root
 sendln "hw-test-session finish"

src/Script_ABC_Blanton/config.ttl

@@ -7,6 +7,10 @@ strTestcase="ENV"      ;ENV,EMC,Margin...etc
 EN_Margin         = 0  ; 1: Enable Margin Test, 0: Disable Margin Test
 EN_log            = 1  ; 1: Enable log, 0: Disable log
 
+;================================================================
+; FAN_SPEED
+;================================================================
+FAN_SPEED = 30
 ;================================================================
 ; Switch Unit Population
 ;================================================================