# WDT_MR, disable watchdog 
mww 0xFFFFFD44 0x00008000

# RSTC_MR, enable user reset
mww 0xfffffd08 0xa5000001

# CKGR_MOR
mww 0xFFFFFC20 0x00000601
sleep 10

# CKGR_PLLR
mww 0xFFFFFC2C 0x00481c0e
sleep 10

# PMC_MCKR
mww 0xFFFFFC30 0x00000007
sleep 10

# PMC_IER
mww 0xFFFFFF60 0x00480100

#
# Enable SDRAM interface.
#

# Enable SDRAM control at PIO A.
mww 0xfffff474 0x3f800000 # PIO_BSR_OFF
mww 0xfffff404 0x3f800000 # PIO_PDR_OFF

# Enable address bus (A0, A2-A11, A13-A17) at PIO B
mww 0xfffff674 0x0003effd # PIO_BSR_OFF
mww 0xfffff604 0x0003effd # PIO_PDR_OFF

# Enable 16 bit data bus at PIO C
mww 0xfffff870 0x0000ffff # PIO_ASR_OFF
mww 0xfffff804 0x0000ffff # PIO_PDR_OFF

# Enable SDRAM chip select
mww 0xffffff80 0x00000002 # EBI_CSA_OFF

# Set SDRAM characteristics in configuration register.
# Hard coded values for MT48LC32M16A2 with 48MHz CPU.
mww 0xffffffb8 0x2192215a # SDRAMC_CR_OFF
sleep 10

# Issue 16 bit SDRAM command: NOP
mww 0xffffffb0 0x00000011 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 

# Issue 16 bit SDRAM command: Precharge all
mww 0xffffffb0 0x00000012 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 

# Issue 8 auto-refresh cycles
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 
mww 0xffffffb0 0x00000014 # SDRAMC_MR_OFF
mww 0x20000000 0x00000000 

# Issue 16 bit SDRAM command: Set mode register  
mww 0xffffffb0 0x00000013 # SDRAMC_MR_OFF
mww 0x20000014 0xcafedede

# Set refresh rate count ???
mww 0xffffffb4 0x00000013 # SDRAMC_TR_OFF

# Issue 16 bit SDRAM command: Normal mode
mww 0xffffffb0 0x00000010 # SDRAMC_MR_OFF
mww 0x20000000 0x00000180

#
# Enable external reset key.
#
mww 0xfffffd08 0xa5000001

