util/amdtools/update_efs_spi_speed

   1 #!/usr/bin/env bash
   2 # SPDX-License-Identifier: BSD-3-Clause
   3
   4 ROM="$1"
   5 declare -i NEW_SPEED="$2"
   6
   7 readonly EFS_SIG_DWORD="55aa55aa"
   8 readonly FAST_SPEED_NEW_F15_MOD_60_6F_OFFSET=0x41
   9 readonly SPI_FASTSPEED_F17_MOD_00_2F_OFFSET=0x44
  10 readonly SPI_FASTSPEED_F17_MOD_30_3F_OFFSET=0x48
  11
  12 # print out the very simple usage
  13 usage() {
  14   echo "Usage: $0 <ROM> <Speed>"
  15   echo "  Speed must be between 0 & 5"
  16   echo "    0: 66.66Mhz"
  17   echo "    1: 33.33MHz"
  18   echo "    2: 22.22MHz"
  19   echo "    3: 16.66MHz"
  20   echo "    4: 100MHz"
  21   echo "    5: 800KHz"
  22 }
  23
  24 # Validate the input parameters
  25 if [[ $# -ne 2 || ! -f "${ROM}" || "${NEW_SPEED}" -lt 0 || "${NEW_SPEED}" -gt 5 ]]; then
  26   usage
  27   exit 1
  28 fi
  29
  30 # Read a 32, 16, or 8 bit value from a location in a binary file
  31 getval() {
  32   local location=$1
  33   local length=$2
  34
  35   if [[ ${length} -eq 1 ]]; then
  36     dd "if=${ROM}" bs=1 "skip=${location}" "count=${length}" 2>/dev/null | hexdump -v -e '1/1 "%02x\n"'
  37   elif [[ ${length} -eq 2 ]]; then
  38     dd "if=${ROM}" bs=1 "skip=${location}" "count=${length}" 2>/dev/null | hexdump -v -e '1/2 "%04x\n"'
  39   elif [[ ${length} -eq 4 ]]; then
  40     dd "if=${ROM}" bs=1 "skip=${location}" "count=${length}" 2>/dev/null | hexdump -v -e '1/4 "%08x\n"'
  41   else
  42     echo "Error: invalid value"
  43     exit 1
  44   fi
  45 }
  46
  47 # Update a location in a binary
  48 # Note that the passed in value must be formatted correctly:
  49 # Each byte needs to be specified as "\\xXX" where X is a hex digit
  50 setval() {
  51   local location=$1
  52   local length=$2
  53   local hexval=$3
  54
  55   # shellcheck disable=SC2059
  56   if ! printf "$hexval" | dd "of=${ROM}" bs=1 "seek=${location}" "count=${length}" conv=notrunc status=none; then
  57     echo "Error: Could not write to ${ROM}"
  58     exit 1
  59   fi
  60 }
  61
  62 # Print the speed associated with the passed-in value
  63 showspeed() {
  64   local speedval=$1
  65   case ${speedval} in
  66   0 | 00) echo "0: 66.66Mhz" ;;
  67   1 | 01) echo "1: 33.33MHz" ;;
  68   2 | 02) echo "2: 22.22MHz" ;;
  69   3 | 03) echo "3: 16.66MHz" ;;
  70   4 | 04) echo "4: 100MHz" ;;
  71   5 | 05) echo "5: 800KHz" ;;
  72   ff) echo "Error: Speed not set" ;;
  73   *) echo "Error: Unknown speed (${speedval})" ;;
  74   esac
  75 }
  76
  77 # Locate the SPI speed data and update it to the new speed
  78 update_efs() {
  79   local location=$1
  80   local updated_speed=0
  81
  82   for speed_offset in FAST_SPEED_NEW_F15_MOD_60_6F_OFFSET SPI_FASTSPEED_F17_MOD_00_2F_OFFSET SPI_FASTSPEED_F17_MOD_30_3F_OFFSET; do
  83     local speed_val
  84     local speed_loc=$((location + speed_offset))
  85     speed_val=$(getval "${speed_loc}" "1")
  86
  87     if [[ "${speed_val}" != "ff" ]]; then
  88       printf "Found speed value of %s at %#06x\n" "$(showspeed "${speed_val}")" "${speed_loc}"
  89       updated_speed=1
  90       setval "${speed_loc}" "1" "\\x0${NEW_SPEED}"
  91       speed_val=$(getval "${speed_loc}" "1")
  92       printf "New speed value: %s\n" "$(showspeed "${speed_val}")"
  93     fi
  94
  95   done
  96   if [[ ${updated_speed} -eq 0 ]]; then
  97     echo "Error: Could not find speed value to update."
  98     exit 1
  99   fi
 100 }
 101
 102 # Find the EFS location and update the speed
 103 main() {
 104   local location
 105   local val
 106
 107   for i in {0..5}; do
 108     location="$((0xffffff - (0x80000 << i) + 0x20000 + 1))"
 109     val="$(getval "${location}" 4 )"
 110     if [[ "${val}" == "${EFS_SIG_DWORD}" ]]; then
 111       printf "EFS found at %#06x\n" "${location}"
 112       update_efs "${location}"
 113       exit 0
 114     fi
 115   done
 116
 117   echo "Error: EFS not found in ${ROM}."
 118   exit 1
 119 }
 120
 121 main