1 # http://www.atmel.com/dyn/products/tools_card.asp?tool_id=4394
3 # use combined on interfaces or targets that can't set TRST/SRST separately
4 reset_config trst_and_srst srst_pulls_trst
6 if { [info exists CHIPNAME] } {
7 set _CHIPNAME $CHIPNAME
12 if { [info exists ENDIAN] } {
18 if { [info exists CPUTAPID] } {
19 set _CPUTAPID $CPUTAPID
21 set _CPUTAPID 0x40700f0f
24 jtag newtap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID
26 set _TARGETNAME $_CHIPNAME.cpu
27 target create $_TARGETNAME arm7tdmi -endian $_ENDIAN -chain-position $_TARGETNAME
29 $_TARGETNAME configure -event reset-start {
30 # start off real slow when we're running off internal RC oscillator
34 proc peek32 {address} {
35 mem2array t 32 $address 1
39 # Wait for an expression to be true with a timeout
40 proc wait_state {expression} {
41 for {set i 0} {$i < 1000} {set i [expr $i + 1]} {
42 if {[uplevel 1 $expression] == 0} {
46 return -code 1 "Timed out"
49 # Use a global variable here to be able to tinker interactively with
50 # post reset jtag frequency.
52 # Danger!!!! Even 16MHz kinda works with this target, but
53 # it needs to be as low as 2000kHz to be stable.
54 set post_reset_khz 2000
56 $_TARGETNAME configure -event reset-init {
57 echo "Configuring master clock"
59 mww 0xfffffd44 0xff008000
61 mww 0xfffffd08 0xa5000001
62 # Enable main oscillator
63 mww 0xFFFFFc20 0x00000f01
64 wait_state {expr {([peek32 0xFFFFFC68] & 0x1) == 0}}
67 mww 0xFFFFFc28 0x20072801
68 wait_state {expr {([peek32 0xFFFFFC68] & 0x2) == 0}}
71 mww 0xFFFFFC30 0x00000004
72 wait_state {expr {([peek32 0xFFFFFC68] & 0x8) == 0}}
74 # Select master clock to 48MHz
75 mww 0xFFFFFC30 0x00000006
76 wait_state {expr {([peek32 0xFFFFFC68] & 0x8) == 0}}
78 echo "Master clock ok."
80 # Now that we're up and running, crank up speed!
81 global post_reset_khz ; adapter_khz $post_reset_khz
83 echo "Configuring the SDRAM controller..."
85 # Configure EBI Chip select for SDRAM
86 mww 0xFFFFEF30 0x00000102
88 # Enable clock on EBI PIOs
89 mww 0xFFFFFC10 0x00000004
91 # Configure PIO for SDRAM
92 mww 0xFFFFF470 0xFFFF0000
93 mww 0xFFFFF474 0x00000000
94 mww 0xFFFFF404 0xFFFF0000
97 mww 0xFFFFEA08 0xA63392F9
103 # Precharge All Banks command
108 mww 0xFFFFEA00 0x00000004
109 mww 0x20000010 0x00000001
112 mww 0xFFFFEA00 0x00000004
113 mww 0x20000020 0x00000002
116 mww 0xFFFFEA00 0x00000004
117 mww 0x20000030 0x00000003
120 mww 0xFFFFEA00 0x00000004
121 mww 0x20000040 0x00000004
124 mww 0xFFFFEA00 0x00000004
125 mww 0x20000050 0x00000005
128 mww 0xFFFFEA00 0x00000004
129 mww 0x20000060 0x00000006
132 mww 0xFFFFEA00 0x00000004
133 mww 0x20000070 0x00000007
136 mww 0xFFFFEA00 0x00000004
137 mww 0x20000080 0x00000008
140 mww 0xFFFFEA00 0x00000003
142 # Perform LMR burst=1, lat=2
143 mww 0x20000020 0xCAFEDEDE
146 mww 0xFFFFEA04 0x00000203
149 mww 0xFFFFEA00 0x00000000
150 mww 0x20000000 0x00000000
152 #remap internal memory at address 0x0
155 echo "SDRAM configuration ok."
158 $_TARGETNAME configure -work-area-phys 0x00200000 -work-area-size 0x4000 -work-area-backup 0
160 arm7_9 dcc_downloads enable
161 arm7_9 fast_memory_access enable
163 #set _FLASHNAME $_CHIPNAME.flash
164 #flash bank $_FLASHNAME at91sam7 0 0 0 0 $_TARGETNAME 0 0 0 0 0 0 0 18432