tcl/board/kc100.cfg

   1 # Knovative KC-100 cable modem
   2
   3 # TNETC4401PYP, 208-QFP U3
   4 source [find target/tnetc4401.cfg]
   5
   6 # 14-pin EJTAG on JP1. Standard pinout, 1-3-5-7-9-11 = nTRST-TDI-TDO-TMS-TCK-nSRST. Use 2 for GND.
   7 # Was initially disabled in hardware; had to add a solder bridge reenabling R124, R125 on back.
   8 reset_config trst_and_srst separate
   9
  10 # 16Mb Intel CFI flash. Note this CPU has an internal ROM at 0x1FC0000 (phys) for cold boot.
  11 # All that really does is some minimal checks before jumping to external flash at 0x00000000 phys.
  12 # That is remapped to 0xB0000000 uncached, 0x90000000 cached.
  13 flash bank intel cfi 0xB0000000 0x200000 2 2 $_TARGETNAME
  14
  15 # Perform this after a clean reboot, halt, and reset init (which should also leave it halted).
  16 proc kc100_dump_flash {} {
  17         echo "Probing 48 TSOP Intel CFI flash chip (2MB)..."
  18         flash probe intel
  19         echo "Dumping 2MB flash chip to flashdump.bin.
  20         flash read_bank 0 flashdump.bin 0 0x200000
  21 }
  22
  23 #TODO figure out memory init sequence to be able to dump from cached segment instead
  24
  25 # There is also a serial console on JP2, 3-5-6 = TX-RX-GND. 9600/8/N/1.
  26
  27 # Possibly of note, this modem's ancient ethernet port does not support Auto-MDIX.
  28
  29 # This modem in many ways appears to be essentially a clone of the SB5120. See usbjtag.com.
  30 # The firmware/OS is also susceptible to many of the same procedures in "Hacking the Cable Modem"
  31 # by DerEngel (Ryan Harris), available from No Starch Press.