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tcl/target: Enable using vectreset for CC3320SF targets 

On CC32xx family of devices, sysrequest is disabled, and
vectreset is blocked by the boot loader (stops in a while(1)
statement). srst reset can leave the target in a state
that prevents debug.

This change enables using vectreset on SF variants by
moving the PC to the start of the user application in
internal flash. This allows for a more reliable reset,
but with two caveats:

1) This only works for the SF variant with internal
   flash.

2) This only resets the CPU and not any peripherals.

Tested on CC3220SF rev B Launchpad in both SWD and
JTAG modes. Confirmed proper behavior of reset,
reset init, reset halt, and reset run commands.

Update: reworked per comment in code review. Re-tested
with CC3220SF Launchpad as both CC3220SF and as
CC32xx board to confirm reset behavior as expected.

Update: Added adapter srst delay 1100 line to the
CC3200 LaunchXL configuration file.

Change-Id: Ibc042d785c846c2223ae55b8f2410b75ed2df354
Signed-off-by: Edward Fewell <efewell@ti.com>
Reviewed-on: http://openocd.zylin.com/5489
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Edward Fewell 2020-03-02 14:04:24 -06:00 committed by Antonio Borneo
parent d35c44c743
commit 4d7c48fb80
4 changed files with 32 additions and 3 deletions
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1
tcl/board/ti_cc3200_launchxl.cfg
View File

@ -18,3 +18,4 @@ set WORKAREASIZE 0x40000
source [find target/ti_cc32xx.cfg]
reset_config srst_only
adapter srst delay 1100

3
tcl/board/ti_cc32xx_launchpad.cfg
View File

@ -5,3 +5,6 @@ source [find interface/xds110.cfg]
adapter speed 8500
transport select swd
source [find target/ti_cc32xx.cfg]
reset_config srst_only
adapter srst delay 1100

28
tcl/target/ti_cc3220sf.cfg
View File

@ -10,3 +10,31 @@ source [find target/ti_cc32xx.cfg]
set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME cc3220sf 0 0 0 0 $_TARGETNAME
#
# On CC32xx family of devices, sysreqreset is disabled, and vectreset is
# blocked by the boot loader (stops in a while(1) statement). srst reset can
# leave the target in a state that prevents debug. The following uses the
# soft_reset_halt command to reset and halt the target. Then the PC and stack
# are initialized from internal flash. This allows for a more reliable reset,
# but with two caveats: it only works for the SF variant that has internal
# flash, and it only resets the CPU and not any peripherals.
#
proc ocd_process_reset_inner { MODE } {
soft_reset_halt
# Intialize MSP, PSP, and PC from vector table at flash 0x01000800
mem2array boot 32 0x01000800 2
reg msp $boot(0)
reg psp $boot(0)
reg pc $boot(1)
if { 0 == [string compare $MODE run ] } {
resume
}
cc32xx.cpu invoke-event reset-end
}

3
tcl/target/ti_cc32xx.cfg
View File

@ -59,6 +59,3 @@ if { [info exists WORKAREASIZE] } {
}
$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
reset_config srst_only
adapter srst delay 1100