更新一下文档

test/run_boot_test.ps1

@@ -33,7 +33,7 @@ param(
     [int]$InitialTimeoutMs = 90000,
     [int]$IdleTimeoutMs = 8000,
     [int]$MaxBytes = 65536,
-    [string]$FlashCmd = "D:\Code\DTU 程序\STM32F4-Base\MDK-ARM\download.bat",
+    [string]$FlashCmd = "",
     [string]$Required = "App init OK;Network Init;net init: OK",
     [string]$Forbidden = "FAIL;ERROR;HardFault",
     [string]$OutDir = "$env:TEMP\opencode",
@@ -46,6 +46,12 @@ $scriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
 $captureScript = Join-Path $scriptDir "serial_capture.ps1"
 $verifyScript = Join-Path $scriptDir "verify_log.ps1"
 
+# Default flash command: resolve relative to this script's repo location
+# (the old hardcoded absolute path pointed at a stale checkout location).
+if (-not $FlashCmd) {
+    $FlashCmd = Join-Path $scriptDir "..\MDK-ARM\download.bat"
+}
+
 if (-not (Test-Path -LiteralPath $captureScript)) {
     Write-Output "RUN_TEST_ERROR: serial_capture.ps1 not found"
     exit 2