tinyriscv-openocd/tcl/target/at91sam9260_ext_RAM_ext_flash.cfg

jtag_khz 4


######################################
# Target:    Atmel AT91SAM9260
######################################

if { [info exists CHIPNAME] } {
   set  _CHIPNAME $CHIPNAME
} else {
   set  _CHIPNAME at91sam9260
}

if { [info exists ENDIAN] } {
   set  _ENDIAN $ENDIAN
} else {
   set  _ENDIAN little
}

if { [info exists CPUTAPID ] } {
   set _CPUTAPID $CPUTAPID
} else {
  # force an error till we get a good number
   set _CPUTAPID 0x0792603f
}

reset_config trst_and_srst


jtag_nsrst_delay 200
jtag_ntrst_delay 200


jtag newtap $_CHIPNAME cpu -irlen 4 -ircapture 0x1 -irmask 0xf -expected-id $_CPUTAPID


######################
# Target configuration
######################

set _TARGETNAME $_CHIPNAME.cpu
target create $_TARGETNAME arm926ejs -endian $_ENDIAN -chain-position $_TARGETNAME -variant arm926ejs

$_TARGETNAME invoke-event halted

# Internal sram1 memory
$_TARGETNAME configure -work-area-phys 0x00300000 -work-area-size 0x1000 -work-area-backup 1

scan_chain
$_TARGETNAME configure -event reset-deassert-post {at91sam_init}


# Flash configuration
#flash bank cfi <base> <size> <chip width> <bus width> <target#>
flash bank cfi 0x10000000 0x01000000 2 2 $_TARGETNAME


proc at91sam_init { } {

	# at reset chip runs at 32khz
	jtag_khz 8
	halt
	mww 0xfffffd08 0xa5000501         # RSTC_MR : enable user reset
	mww 0xfffffd44 0x00008000         # WDT_MR : disable watchdog

	mww 0xfffffc20 0x00004001         # CKGR_MOR : enable the main oscillator
	sleep 20                          # wait 20 ms
	mww 0xfffffc30 0x00000001         # PMC_MCKR : switch to main oscillator
	sleep 10                          # wait 10 ms
	mww 0xfffffc28 0x2060bf09         # CKGR_PLLAR: Set PLLA Register for 198,656MHz
	sleep 20                          # wait 20 ms
	mww 0xfffffc30 0x00000101         # PMC_MCKR : Select prescaler
	sleep 10                          # wait 10 ms
	mww 0xfffffc30 0x00000102         # PMC_MCKR : Clock from PLLA is selected
	sleep 10                          # wait 10 ms

	# Now run at anything fast... ie: 10mhz!
	jtag_khz 10000                    # Increase JTAG Speed to 6 MHz
	arm7_9 dcc_downloads enable       # Enable faster DCC downloads

	mww 0xffffec00 0x0a0a0a0a         # SMC_SETUP0 : Setup SMC for Intel NOR Flash JS28F128P30T85 128MBit
	mww 0xffffec04 0x0b0b0b0b         # SMC_PULSE0
	mww 0xffffec08 0x00160016         # SMC_CYCLE0
	mww 0xffffec0c 0x00161003         # SMC_MODE0

	flash probe 0                     # Identify flash bank 0

	mww 0xfffff870 0xffff0000         # PIO_ASR : Select peripheral function for D15..D31
	mww 0xfffff804 0xffff0000         # PIO_PDR : Disable PIO function for D15..D31

	mww 0xffffef1c 0x2                # EBI_CSA : Assign EBI Chip Select 1 to SDRAM

	mww 0xffffea08 0x85227259         # SDRAMC_CR : Configure SDRAM (2 x Samsung K4S561632H-UC75 : 4M x 16Bit x 4 Banks)
	#mww 0xffffea08 0x85227254         # SDRAMC_CR : Configure SDRAM (2 x Samsung K4S641632H-UC75 : 1M x 16Bit x 4 Banks)

	mww 0xffffea00 0x1                # SDRAMC_MR : issue a NOP command
	mww 0x20000000 0
	mww 0xffffea00 0x2                # SDRAMC_MR : issue an 'All Banks Precharge' command
	mww 0x20000000 0
	mww 0xffffea00 0x4                # SDRAMC_MR : issue 8 x 'Auto-Refresh' Command
	mww 0x20000000 0
	mww 0xffffea00 0x4
	mww 0x20000000 0
	mww 0xffffea00 0x4
	mww 0x20000000 0
	mww 0xffffea00 0x4
	mww 0x20000000 0
	mww 0xffffea00 0x4
	mww 0x20000000 0
	mww 0xffffea00 0x4
	mww 0x20000000 0
	mww 0xffffea00 0x4
	mww 0x20000000 0
	mww 0xffffea00 0x4
	mww 0x20000000 0
	mww 0xffffea00 0x3                # SDRAMC_MR : issue a 'Load Mode Register' command
	mww 0x20000000 0
	mww 0xffffea00 0x0                # SDRAMC_MR : normal mode
	mww 0x20000000 0
	mww 0xffffea04 0x5d2              # SDRAMC_TR : Set refresh timer count to 15us
}