3 set CHIPNAME at91sam9260
4 set CPUTAPID 0x0792603f
6 source [find target/at91sam9260.cfg]
8 $_TARGETNAME configure -event reset-init {at91sam_init}
11 proc at91sam_init { } {
13 # at reset chip runs at 32 kHz => 1/8 * 32 kHz = 4 kHz
16 # Enable user reset and disable watchdog
17 mww 0xfffffd08 0xa5000501 ;# RSTC_MR : enable user reset
18 mww 0xfffffd44 0x00008000 ;# WDT_MR : disable watchdog
21 mww 0xfffffc20 0x00004001 ;# CKGR_MOR : enable the main oscillator (18.432 MHz)
22 sleep 20 ;# wait 20 ms
23 mww 0xfffffc30 0x00000001 ;# PMC_MCKR : switch to main oscillator
24 sleep 10 ;# wait 10 ms
26 # now we are running at 18.432 MHz kHz => 1/8 * 18.432 MHz = 2.304 MHz
29 mww 0xfffffc28 0x2060bf09 ;# CKGR_PLLAR: Set PLLA Register for 198,656MHz
30 sleep 20 ;# wait 20 ms
31 mww 0xfffffc2c 0x207c3f0c ;# CKGR_PLLBR: Set PLLB Register for USB usage (USB_CLK = 48 MHz)
32 sleep 10 ;# wait 10 ms
33 mww 0xfffffc30 0x00000101 ;# PMC_MCKR : Select prescaler
34 sleep 10 ;# wait 10 ms
35 mww 0xfffffc30 0x00000102 ;# PMC_MCKR : Clock from PLLA is selected
36 sleep 10 ;# wait 10 ms
38 # now we are running at 198.656 MHz kHz => full speed jtag
41 arm7_9 dcc_downloads enable ;# Enable faster DCC downloads
43 # Configure PIO Controller for SDRAM data-lines D16-D31
44 # PC16-PC31 = Peripheral A: D16-D32
45 mww 0xfffff844 0xffff0000 ;# Interrupt Disable
46 mww 0xfffff854 0xffff0000 ;# Multi-Drive Disable
47 mww 0xfffff860 0xffff0000 ;# Pull-Up Disable
48 mww 0xfffff870 0xffff0000 ;# PIO_ASR : Select peripheral A function for D15..D31
49 mww 0xfffff804 0xffff0000 ;# PIO_PDR : Disable PIO function for D15..D31 (Peripheral function enable)
50 mww 0xfffffc10 0x00000010 ;# Enable PIO-C Clock in PMC (PID=4)
53 mww 0xffffef1c 0x2 ;# EBI_CSA : Assign EBI Chip Select 1 to SDRAM
54 mww 0xffffea08 0x85227259 ;# SDRAMC_CR : Configure SDRAM (IS42S32160A: 4M Words x 32 Bits x 4 Banks (512-Mbit))
55 mww 0xffffea00 0x1 ;# SDRAMC_MR : issue a NOP command
57 mww 0xffffea00 0x2 ;# SDRAMC_MR : issue an 'All Banks Precharge' command
59 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (1st)
61 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (2nd)
63 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (3th)
65 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (4th)
67 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (5th)
69 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (6th)
71 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (7th)
73 mww 0xffffea00 0x4 ;# SDRAMC_MR : issue an 'Auto-Refresh' command (8th)
75 mww 0xffffea00 0x3 ;# SDRAMC_MR : issue a 'Load Mode Register' command
77 mww 0xffffea00 0x0 ;# SDRAMC_MR : Normal Mode
79 mww 0xFFFFEA04 0x30d ;# SDRAM Refresh Time Register
80 # datasheet: 8k refresh cycles / 64 ms
81 # MCLK / (8*1024 / 64e-3) = 100e6 / 128000 = 781 = 0x30d