riscv-openocd/tcl/board/olimex_sam9_l9260.cfg

################################################################################
# Olimex SAM9-L9260 Development Board
#
# http://www.olimex.com/dev/sam9-L9260.html
#
# Atmel AT91SAM9260 : PLLA = 198.656 MHz, MCK = 99.328 MHz
#                     PMC configured for external 18.432 MHz crystal
#
# 32-bit SDRAM : 2 x Samsung K4S561632J-UC75, 4M x 16Bit x 4 Banks
# 8-bit NAND Flash : 1 x Samsung K9F4G08U0M, 512M x 8Bit
# Dataflash : 1 x Atmel AT45DB161D, 16Mbit
#
################################################################################

source [find target/at91sam9260.cfg]

# NTRST_E jumper is enabled by default, so we don't need to override the reset
# config.
#reset_config srst_only

$_TARGETNAME configure -event reset-start {
	# At reset, CPU runs at 32.768 kHz.  JTAG frequency must be 6 times slower if
	# RCLK is not supported.
	jtag_rclk 5
	halt
	
	# RSTC_MR : enable user reset, reset length is 64 slow clock cycles.  MMU may 
	# be enabled... use physical address.
	mww phys 0xfffffd08 0xa5000501
}

$_TARGETNAME configure -event reset-init {
	mww 0xfffffd44 0x00008000 # WDT_MR : disable watchdog
	
	##
	# Clock configuration for 99.328 MHz main clock.
	##
	mww 0xfffffc20 0x00004001 # CKGR_MOR : enable main oscillator, 512 slow clock startup
	sleep 20                  # wait 20 ms (need 15.6 ms for startup)
	mww 0xfffffc30 0x00000001 # PMC_MCKR : switch to main oscillator (18.432 MHz)
	sleep 10                  # wait 10 ms
	mww 0xfffffc28 0x2060bf09 # CKGR_PLLAR : 18.432 MHz / 9 * 97 = 198.656 MHz, 63 slow clock startup
	sleep 20                  # wait 20 ms (need 1.9 ms for startup)
	mww 0xfffffc30 0x00000101 # PMC_MCKR : no scale on proc clock, master is proc / 2
	sleep 10                  # wait 10 ms
	mww 0xfffffc30 0x00000102 # PMC_MCKR : switch to PLLA (99.328 MHz)
	
	# Increase JTAG speed to 6 MHz if RCLK is not supported.
	jtag_rclk 6000
	
	arm7_9 dcc_downloads enable # Enable faster DCC downloads.
	
	##
	# SDRAM configuration for 2 x Samsung K4S561632J-UC75, 4M x 16Bit x 4 Banks.
	##
	mww 0xfffff870 0xffff0000 # PIOC_ASR : select peripheral function for D15..D31
	mww 0xfffff804 0xffff0000 # PIOC_PDR : disable PIO function for D15..D31
	
	mww 0xffffef1c 0x00010002 # EBI_CSA : assign EBI CS1 to SDRAM, VDDIOMSEL set for +3V3 memory
	
	mww 0xffffea08 0x85237259 # SDRAMC_CR : configure SDRAM for Samsung chips
	
	mww 0xffffea00 0x1        # SDRAMC_MR : issue 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 0x2b6      # SDRAMC_TR : set refresh timer count to 7 us
}