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.
	##
    puts "Setting up 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.
	##
    puts "Configuring SDRAM"
	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

    ##
    # NAND Flash Configuration for 1 x Samsung K9F4G08U0M, 512M x 8Bit.
    ##
    puts "Configuring NAND flash"
    mww 0xfffffc10 0x00000010 ;# PMC_PCER : enable PIOC clock
    mww 0xfffff800 0x00006000 ;# PIOC_PER : enable PIO function for 13(RDY/~BSY) and 14(~CS)
    mww 0xfffff810 0x00004000 ;# PIOC_OER : enable output on 14
    mww 0xfffff814 0x00002000 ;# PIOC_ODR : disable output on 13
    mww 0xfffff830 0x00004000 ;# PIOC_SODR : set 14 to disable NAND
    mww 0xfffff864 0x00002000 ;# PIOC_PUER : enable pull-up on 13
    
    mww 0xffffef1c 0x0001000A ;# EBI_CSA : assign EBI CS3 to NAND, same settings as before
    
    mww 0xffffec30 0x00010001 ;# SMC_SETUP3 : 1 clock cycle setup for NRD and NWE
    mww 0xffffec34 0x03030303 ;# SMC_PULSE3 : 3 clock cycle pulse for all signals
    mww 0xffffec38 0x00050005 ;# SMC_CYCLE3 : 5 clock cycle NRD and NWE cycle
    mww 0xffffec3C 0x00020003 ;# SMC_MODE3 : NRD and NWE control, no NWAIT, 8-bit DBW, 
                               #             3 TDF cycles, no optimization
    
    mww 0xffffe800 0x00000001 ;# ECC_CR : reset the ECC parity registers
    mww 0xffffe804 0x00000002 ;# ECC_MR : page size is 2112 words (word is 8 bits)
    
    nand probe at91sam9260.flash
    
    ##
    # Dataflash configuration for 1 x Atmel AT45DB161D, 16Mbit
    ##
    puts "Setting up dataflash"
    mww 0xfffff404 0x00000807 ;# PIOA_PDR : disable PIO function for 0(SPI0_MISO), 1(SPI0_MOSI), 
                               #            2(SPI0_SPCK), and 11(SPI0_NPCS1)
    mww 0xfffff470 0x00000007 ;# PIOA_ASR : select peripheral A function for 0, 1, and 2
    mww 0xfffff474 0x00000800 ;# PIOA_BSR : select peripheral B function for 11
    mww 0xfffffc10 0x00001000 ;# PMC_PCER : enable SPI0 clock
    
    mww 0xfffc8000 0x00000080 ;# SPI0_CR : software reset SPI0
    mww 0xfffc8000 0x00000080 ;# SPI0_CR : again to be sure
    mww 0xfffc8004 0x000F0011 ;# SPI0_MR : master mode with nothing selected
    
    mww 0xfffc8034 0x011a0302 ;# SPI0_CSR1 : capture on leading edge, 8-bits/tx. 33MHz baud, 
                               #             250ns delay before SPCK, 250ns b/n tx
    
    mww 0xfffc8004 0x000D0011 ;# SPI0_MR : same config, select NPCS1
    mww 0xfffc8000 0x00000001 ;# SPI0_CR : enable SPI0
}

nand device at91sam9260.flash at91sam9 at91sam9260.cpu 0x40000000 0xffffe800
at91sam9 cle 0 22
at91sam9 ale 0 21
at91sam9 rdy_busy 0 0xfffff800 13
at91sam9 ce 0 0xfffff800 14