util/amdtools: Add script to update the SPI speed in the EFS header
The update_efs_spi_speed allows changing the SPI speed manually in a binary that has already been built. This will allow binaries not built for the EM100 SPI ROM emulator to be updated so that they will work. There is a corresponding change that will check to see if the EFS value has been modified from the original speed and will prevent coreboot from updating the SPI speed and mode. BUG=b:177233017 TEST=Update SPI speed in existing binary. See that SPI speed has changed. Signed-off-by: Martin Roth <martin@coreboot.org> Change-Id: I905a9fd8bd93a28aab927dffecbbcf24934b9e03 Reviewed-on: https://review.coreboot.org/c/coreboot/+/56644 Reviewed-by: Raul Rangel <rrangel@chromium.org> Reviewed-by: Karthik Ramasubramanian <kramasub@google.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
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Martin Roth
Felix Held
parent
859ecdf517
commit
a95cd265bd
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#!/usr/bin/env bash
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# SPDX-License-Identifier: BSD-3-Clause
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ROM="$1"
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declare -i NEW_SPEED="$2"
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readonly EFS_SIG_DWORD="55aa55aa"
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readonly FAST_SPEED_NEW_F15_MOD_60_6F_OFFSET=0x41
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readonly SPI_FASTSPEED_F17_MOD_00_2F_OFFSET=0x44
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readonly SPI_FASTSPEED_F17_MOD_30_3F_OFFSET=0x48
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# print out the very simple usage
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usage() {
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echo "Usage: $0 <ROM> <Speed>"
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echo " Speed must be between 0 & 5"
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echo " 0: 66.66Mhz"
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echo " 1: 33.33MHz"
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echo " 2: 22.22MHz"
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echo " 3: 16.66MHz"
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echo " 4: 100MHz"
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echo " 5: 800KHz"
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}
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# Validate the input parameters
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if [[ $# -ne 2 || ! -f "${ROM}" || "${NEW_SPEED}" -lt 0 || "${NEW_SPEED}" -gt 5 ]]; then
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usage
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exit 1
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fi
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# Read a 32, 16, or 8 bit value from a location in a binary file
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getval() {
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local location=$1
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local length=$2
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if [[ ${length} -eq 1 ]]; then
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dd "if=${ROM}" bs=1 "skip=${location}" "count=${length}" 2>/dev/null | hexdump -v -e '1/1 "%02x\n"'
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elif [[ ${length} -eq 2 ]]; then
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dd "if=${ROM}" bs=1 "skip=${location}" "count=${length}" 2>/dev/null | hexdump -v -e '1/2 "%04x\n"'
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elif [[ ${length} -eq 4 ]]; then
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dd "if=${ROM}" bs=1 "skip=${location}" "count=${length}" 2>/dev/null | hexdump -v -e '1/4 "%08x\n"'
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else
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echo "Error: invalid value"
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exit 1
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fi
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}
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# Update a location in a binary
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# Note that the passed in value must be formatted correctly:
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# Each byte needs to be specified as "\\xXX" where X is a hex digit
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setval() {
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local location=$1
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local length=$2
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local hexval=$3
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# shellcheck disable=SC2059
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if ! printf "$hexval" | dd "of=${ROM}" bs=1 "seek=${location}" "count=${length}" conv=notrunc status=none; then
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echo "Error: Could not write to ${ROM}"
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exit 1
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fi
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}
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# Print the speed associated with the passed-in value
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showspeed() {
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local speedval=$1
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case ${speedval} in
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0 | 00) echo "0: 66.66Mhz" ;;
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1 | 01) echo "1: 33.33MHz" ;;
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2 | 02) echo "2: 22.22MHz" ;;
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3 | 03) echo "3: 16.66MHz" ;;
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4 | 04) echo "4: 100MHz" ;;
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5 | 05) echo "5: 800KHz" ;;
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ff) echo "Error: Speed not set" ;;
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*) echo "Error: Unknown speed (${speedval})" ;;
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esac
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}
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# Locate the SPI speed data and update it to the new speed
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update_efs() {
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local location=$1
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local updated_speed=0
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for speed_offset in FAST_SPEED_NEW_F15_MOD_60_6F_OFFSET SPI_FASTSPEED_F17_MOD_00_2F_OFFSET SPI_FASTSPEED_F17_MOD_30_3F_OFFSET; do
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local speed_val
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local speed_loc=$((location + speed_offset))
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speed_val=$(getval "${speed_loc}" "1")
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if [[ "${speed_val}" != "ff" ]]; then
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printf "Found speed value of %s at %#06x\n" "$(showspeed "${speed_val}")" "${speed_loc}"
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updated_speed=1
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setval "${speed_loc}" "1" "\\x0${NEW_SPEED}"
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speed_val=$(getval "${speed_loc}" "1")
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printf "New speed value: %s\n" "$(showspeed "${speed_val}")"
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fi
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done
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if [[ ${updated_speed} -eq 0 ]]; then
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echo "Error: Could not find speed value to update."
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exit 1
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fi
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}
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# Find the EFS location and update the speed
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main() {
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local location
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local val
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for i in {0..5}; do
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location="$((0xffffff - (0x80000 << i) + 0x20000 + 1))"
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val="$(getval "${location}" 4 )"
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if [[ "${val}" == "${EFS_SIG_DWORD}" ]]; then
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printf "EFS found at %#06x\n" "${location}"
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update_efs "${location}"
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exit 0
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fi
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done
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echo "Error: EFS not found in ${ROM}."
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exit 1
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}
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main
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