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tcl/stm32mp15x: freeze watchdog, recover SWD after power cycle 

Freeze the IWDG watchdog when cores are halted to prevent a reset
while debugging.

The PMIC present on some board senses the nsrst and forces a power
cycle to the target. The power cycle causes the SWJ-DP to restart
in JTAG mode. If the debugger is using SWD, the mismatch triggers
an error after the reset command.
Ignore the error detected by 'dap init' and proceed executing the
handler. The error in 'dap init' will force a reconnect during the
following 'dap apid', restoring the SWD functionality.

Change-Id: I04fcda6a5b8a1b080ab4e8890ecd0754d5ed12d9
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6599
Tested-by: jenkins
This commit is contained in:
Antonio Borneo 2021-04-07 19:21:27 +02:00
parent 8a522d96c7
commit f4612e06c6
1 changed files with 4 additions and 1 deletions
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5
tcl/target/stm32mp15x.cfg
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@ -97,6 +97,9 @@ axi_secure
proc dbgmcu_enable_debug {} {
# set debug enable bits in DBGMCU_CR to get ap2 and cm4 visible
catch {$::_CHIPNAME.ap1 mww 0xe0081004 0x00000007}
# freeze watchdog 1 and 2 on cores halted
catch {$::_CHIPNAME.ap1 mww 0xe008102c 0x00000004}
catch {$::_CHIPNAME.ap1 mww 0xe008104c 0x00000008}
}
proc toggle_cpu0_dbg_claim0 {} {
@ -116,7 +119,7 @@ proc rcc_enable_traceclk {} {
}
# FIXME: most of handler below will be removed once reset framework get merged
$_CHIPNAME.ap1 configure -event reset-deassert-pre {adapter deassert srst deassert trst;dap init;catch {$::_CHIPNAME.dap apid 1}}
$_CHIPNAME.ap1 configure -event reset-deassert-pre {adapter deassert srst deassert trst;catch {dap init};catch {$::_CHIPNAME.dap apid 1}}
$_CHIPNAME.ap2 configure -event reset-deassert-pre {dbgmcu_enable_debug;rcc_enable_traceclk}
$_CHIPNAME.cpu0 configure -event reset-deassert-pre {$::_CHIPNAME.cpu0 arp_examine}
$_CHIPNAME.cpu1 configure -event reset-deassert-pre {$::_CHIPNAME.cpu1 arp_examine allow-defer}