64 lines
1.5 KiB
INI
64 lines
1.5 KiB
INI
#
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# script for ATMEL sam4, a Cortex-M4 chip
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#
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#
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# sam4 devices can support both JTAG and SWD transports.
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#
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source [find target/swj-dp.tcl]
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if { [info exists CHIPNAME] } {
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set _CHIPNAME $CHIPNAME
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} else {
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set _CHIPNAME sam4
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}
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if { [info exists ENDIAN] } {
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set _ENDIAN $ENDIAN
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} else {
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set _ENDIAN little
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}
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# Work-area is a space in RAM used for flash programming
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# By default use 64kB
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if { [info exists WORKAREASIZE] } {
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set _WORKAREASIZE $WORKAREASIZE
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} else {
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set _WORKAREASIZE 0x4000
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}
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#jtag scan chain
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if { [info exists CPUTAPID] } {
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set _CPUTAPID $CPUTAPID
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} else {
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set _CPUTAPID 0x4ba00477
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}
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swj_newdap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
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set _TARGETNAME $_CHIPNAME.cpu
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target create $_TARGETNAME cortex_m -endian $_ENDIAN -chain-position $_TARGETNAME
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# 16K is plenty, the smallest chip has this much
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$_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
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# JTAG speed should be <= F_CPU/6. F_CPU after reset is 4 MHz, so use F_JTAG = 0.5MHz
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#
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# Since we may be running of an RC oscilator, we crank down the speed a
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# bit more to be on the safe side. Perhaps superstition, but if are
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# running off a crystal, we can run closer to the limit. Note
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# that there can be a pretty wide band where things are more or less stable.
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adapter_khz 500
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adapter_nsrst_delay 100
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if {[using_jtag]} {
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jtag_ntrst_delay 100
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}
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if {![using_hla]} {
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# if srst is not fitted use SYSRESETREQ to
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# perform a soft reset
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cortex_m reset_config sysresetreq
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}
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