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"Tomas Vanek <[email protected]>" just uploaded a new patch set to Gerrit, which 
you can find at https://review.openocd.org/c/openocd/+/9060

-- gerrit

commit 7046b4af8508c70129c497c938d91c5f269f80aa
Author: Tomas Vanek <[email protected]>
Date:   Mon Jul 28 09:36:18 2025 +0200

    tcl/target/atsamv: disable watchdog in reset-init event
    
    Prevent disrupting of 'flash erase_check' or 'flash verify_image'
    running longer than 16 seconds.
    
    Change-Id: I545a1155ac0d237c49f2f3a27235d8a67df2a61b
    Signed-off-by: Tomas Vanek <[email protected]>

diff --git a/tcl/target/atsamv.cfg b/tcl/target/atsamv.cfg
index 1adf1af0ed..9fd89795b6 100644
--- a/tcl/target/atsamv.cfg
+++ b/tcl/target/atsamv.cfg
@@ -41,6 +41,11 @@ target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap 
$_CHIPNAME.dap
 
 $_TARGETNAME configure -work-area-phys 0x20400000 -work-area-size 
$_WORKAREASIZE -work-area-backup 0
 
+$_TARGETNAME configure -event reset-init {
+       # WDT_MR = WDDIS (disable watchdog)
+       mww 0x400E1854 0x8000
+}
+
 adapter speed 1800
 
 if {![using_hla]} {

-- 

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