Add configuration for an old AT91rm9200 board, the Cogent CSB 337. Worth noting from the OpenOCD perspective:
- It got a real hardware trace port connector; wired up here as much as we can, lacking inexpensive trace-aware dongles. - This is the first in-tree use of the "arm920t cp15" command. It adjusts the CPU clocking and enables i-cache, which gives more than 4x speedup after booting Linux; it's visible even just running U-Boot. Oddly, OpenOCD is numbering its cp15 registers differently than the ARM920T documentation. Haven't sorted that out yet... --- tcl/board/csb337.cfg | 118 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+)
Add configuration for an old AT91rm9200 board, the Cogent CSB 337. Worth noting from the OpenOCD perspective: - It got a real hardware trace port connector; wired up here as much as we can, lacking inexpensive trace-aware dongles. - This is the first in-tree use of the "arm920t cp15" command. It adjusts the CPU clocking and enables i-cache, which gives more than 4x speedup after booting Linux; it's visible even just running U-Boot. Oddly, OpenOCD is numbering its cp15 registers differently than the ARM920T documentation. Haven't sorted that out yet... --- tcl/board/csb337.cfg | 118 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+) --- /dev/null +++ b/tcl/board/csb337.cfg @@ -0,0 +1,118 @@ +# Cogent CSB337 +# http://cogcomp.com/csb_csb337.htm + +source [find target/at91rm9200.cfg] + +# boots from NOR on CS0: 8 MBytes CFI flash, 16-bit bus +flash bank cfi 0x10000000 0x00800000 2 2 $_TARGETNAME + +# ETM9 trace port connector present on this board, 16 data pins. +if { [info exists ETM_DRIVER] } { + etm config $_TARGETNAME 16 normal half $ETM_DRIVER + # OpenOCD may someday support a real trace port driver... + # system config file would need to configure it. +} else { + etm config $_TARGETNAME 16 normal half dummy + etm_dummy config $_TARGETNAME +} + +proc csb337_clk_init { } { + # CPU is in Slow Clock Mode (32KiHz) ... needs slow JTAG clock + jtag_khz 8 + + # CKGR_MOR: start main oscillator (3.6864 MHz) + mww 0xfffffc20 0xff01 + sleep 10 + + # CKGR_PLLAR: start PLL A for CPU and peripherals (184.32 MHz) + mww 0xfffffc28 0x20313e01 + # CKGR_PLLBR: start PLL B for USB timing (96 MHz, with div2) + mww 0xfffffc2c 0x12703e18 + # let PLLs lock + sleep 10 + + # PMC_MCKR: switch to CPU clock = PLLA, master clock = CPU/4 + mww 0xfffffc30 0x0302 + sleep 20 + + # CPU is in Normal Mode ... allows faster JTAG clock speed + jtag_khz 40000 +} + +proc csb337_nor_init { } { + # SMC_CSR0: adjust timings (10 wait states) + mww 0xffffff70 0x1100318a + + flash probe 0 +} + +proc csb337_sdram_init { } { + # enable PIOC clock + mww 0xfffffc10 0x0010 + # PC31..PC16 are D31..D16, with internal pullups like D15..D0 + mww 0xfffff870 0xffff0000 + mww 0xfffff874 0x0 + mww 0xfffff804 0xffff0000 + + # SDRC_CR: set timings + mww 0xffffff98 0x2188b0d5 + + # SDRC_MR: issue all banks precharge to SDRAM + mww 0xffffff90 2 + mww 0x20000000 0 + + # SDRC_MR: 8 autorefresh cycles + mww 0xffffff90 4 + mww 0x20000000 0 + mww 0x20000000 0 + mww 0x20000000 0 + mww 0x20000000 0 + mww 0x20000000 0 + mww 0x20000000 0 + mww 0x20000000 0 + mww 0x20000000 0 + + # SDRC_MR: set SDRAM mode registers (CAS, burst len, etc) + mww 0xffffff90 3 + mww 0x20000080 0 + + # SDRC_TR: set refresh rate + mww 0xffffff94 0x200 + mww 0x20000000 0 + + # SDRC_MR: normal mode, 32 bit bus + mww 0xffffff90 0 + mww 0x20000000 0 +} + +# The rm9200 chip has just been reset. Bring it up far enough +# that we can write flash or run code from SDRAM. +proc csb337_reset_init { } { + csb337_clk_init + + # EBI_CSA: CS0 = NOR, CS1 = SDRAM + mww 0xffffff60 0x02 + + csb337_nor_init + csb337_sdram_init + + # Update CP15 control register ... we don't seem to be able to + # read/modify/write its value through a TCL variable, so just + # write it. Fields are zero unless listed here ... and note + # that OpenOCD numbers this register "2", not "1" (!). + # + # - Core to use Async Clocking mode (so it uses 184 MHz most + # of the time instead of limiting to the master clock rate): + # iA(31) = 1, nF(30) = 1 + # - Icache on (it's disabled now, slowing i-fetches) + # I(12) = 1 + # - Reserved/ones + # 6:3 = 1 + # - Alignment traps enabled + # A(1) = 1 + arm920t cp15 2 0xc000107a +} + +$_TARGETNAME configure -event reset-init {csb337_reset_init} + +# vim:syntax tcl
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