riscv-openocd/tcl/board/unknown_at91sam9260.cfg

# SPDX-License-Identifier: GPL-2.0-or-later

# Thanks to Pieter Conradie for this script!
#
# Unknown vendor board contains:
#
# Atmel AT91SAM9260 : PLLA = 192.512MHz, MCK = 96.256 MHz
#                     OSCSEL configured for internal RC oscillator (22 to 42 kHz)
#
# 16-bit NOR FLASH : Intel JS28F128P30T85 128MBit
# 32-bit SDRAM : 2 x Samsung K4S561632H-UC75, 4M x 16Bit x 4 Banks
##################################################################

# We add to the minimal configuration.
source [find target/at91sam9260.cfg]

$_TARGETNAME configure -event reset-start {
        # At reset CPU runs at 22 to 42 kHz.
        # JTAG Frequency must be 6 times slower.
        jtag_rclk 3
        halt
	# RSTC_MR : enable user reset, MMU may be enabled... use physical address
        mww phys 0xfffffd08 0xa5000501
}


$_TARGETNAME configure -event reset-init {
        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 0x205dbf09         ;# CKGR_PLLAR: Set PLLA Register for 192.512MHz
        sleep 20                          ;# wait 20 ms
        mww 0xfffffc30 0x00000101         ;# PMC_MCKR : Select prescaler (divide by 2)
        sleep 10                          ;# wait 10 ms
        mww 0xfffffc30 0x00000102         ;# PMC_MCKR : Clock from PLLA is selected (96.256 MHz)
        sleep 10                          ;# wait 10 ms

	# Increase JTAG Speed to 6 MHz if RCLK is not supported
        jtag_rclk 6000

	arm7_9 dcc_downloads enable       ;# Enable faster DCC downloads

	mww 0xffffec00 0x01020102         ;# SMC_SETUP0 : Setup SMC for Intel NOR Flash JS28F128P30T85 128MBit
	mww 0xffffec04 0x09070806         ;# SMC_PULSE0
	mww 0xffffec08 0x000d000b         ;# SMC_CYCLE0
	mww 0xffffec0c 0x00001003         ;# 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 0xfffff860 0xffff0000         ;# PIO_PUDR : Disable D15..D31 pull-ups

        mww 0xffffef1c 0x00010102         ;# EBI_CSA  : Assign EBI Chip Select 1 to SDRAM
                                           #            VDDIOMSEL set for +3V3 memory
                                           #            Disable D0..D15 pull-ups

	mww 0xffffea08 0x85227259         ;# SDRAMC_CR : Configure SDRAM (2 x Samsung K4S561632H-UC75 : 4M 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 0x2a2              ;# SDRAMC_TR : Set refresh timer count to 7us
}


#####################
# Flash configuration
#####################

#flash bank <name> cfi <base> <size> <chip width> <bus width> <target>
set _FLASHNAME $_CHIPNAME.flash
flash bank $_FLASHNAME cfi 0x10000000 0x01000000 2 2 $_TARGETNAME