Glyn Tonga2: Faster JTAG speed after CPU/RAM init.

Change-Id: Ib08dae0035355138c468483a7ee2d73aadedf430
Signed-off-by: Uwe Hermann <uwe@hermann-uwe.de>
Reviewed-on: http://openocd.zylin.com/564
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>
__archive__
Uwe Hermann 2012-04-11 00:02:51 +02:00 committed by Spencer Oliver
parent 3c270bb0a9
commit b6068f5a48
1 changed files with 32 additions and 2 deletions

View File

@ -16,10 +16,38 @@ source [find target/tmpa900.cfg]
# Target configuration # # Target configuration #
######################## ########################
$_TARGETNAME configure -event reset-init { tonga2_init } # Initial JTAG speed should not exceed 1/6 of the initial CPU clock
# frequency (24MHz). Be conservative and use 1/8 of the frequency.
# (24MHz / 8 = 3MHz)
adapter_khz 3000
$_TARGETNAME configure -event reset-start {
# Upon reset, set the JTAG frequency to 3MHz again, see above.
echo "Setting JTAG speed to 3MHz until clocks are initialized."
adapter_khz 3000
# Halt the CPU.
halt
# Disable faster memory access for now.
arm7_9 fast_memory_access disable
}
$_TARGETNAME configure -event reset-init {
# Setup clocks, and initialize SRAM and DDR SDRAM.
tonga2_init
# At this point the CPU is running at 192MHz, increase JTAG speed.
# Tests showed that 15MHz works OK, higher speeds can cause problems,
# though. Not sure if this is a CPU issue or JTAG adapter issue.
echo "Increasing JTAG speed to 15MHz."
adapter_khz 15000
# Enable faster memory access.
arm7_9 fast_memory_access enable
}
proc tonga2_init { } { proc tonga2_init { } {
###################### ######################
# PLL initialization # # PLL initialization #
###################### ######################
@ -160,6 +188,8 @@ proc tonga2_init { } {
# smc_direct_cmd_5 (SMC Direct Command register): # smc_direct_cmd_5 (SMC Direct Command register):
# cmd_type = UpdateRegs, chip_select = CS1 # cmd_type = UpdateRegs, chip_select = CS1
mww 0xf4311010 0x00c00000 mww 0xf4311010 0x00c00000
echo "Clocks, SRAM, and DDR SDRAM are now initialized."
} }
####################### #######################