1 # SPDX-License-Identifier: GPL-2.0-or-later
4 # script for ATMEL sam4, a Cortex-M4 chip
8 # sam4 devices can support both JTAG and SWD transports.
10 source [find target/swj-dp.tcl]
12 if { [info exists CHIPNAME] } {
13 set _CHIPNAME $CHIPNAME
18 if { [info exists ENDIAN] } {
24 # Work-area is a space in RAM used for flash programming
26 if { [info exists WORKAREASIZE] } {
27 set _WORKAREASIZE $WORKAREASIZE
29 set _WORKAREASIZE 0x4000
33 if { [info exists CPUTAPID] } {
34 set _CPUTAPID $CPUTAPID
36 set _CPUTAPID 0x4ba00477
39 swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
40 dap create $_CHIPNAME.dap -chain-position $_CHIPNAME.cpu
42 set _TARGETNAME $_CHIPNAME.cpu
43 target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
45 # 16K is plenty, the smallest chip has this much
46 $_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
48 # JTAG speed should be <= F_CPU/6. F_CPU after reset is 4 MHz, so use F_JTAG = 0.5MHz
50 # Since we may be running of an RC oscilator, we crank down the speed a
51 # bit more to be on the safe side. Perhaps superstition, but if are
52 # running off a crystal, we can run closer to the limit. Note
53 # that there can be a pretty wide band where things are more or less stable.
57 adapter srst delay 100
63 # if srst is not fitted use SYSRESETREQ to
64 # perform a soft reset
65 cortex_m reset_config sysresetreq