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# Copyright 2022 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
import("//build_overrides/pi_pico.gni")
import("//build_overrides/pigweed.gni")
import("$dir_pw_build/exec.gni")
import("$dir_pw_build/python_action.gni")
import("$dir_pw_build/target_types.gni")
# TODO(amontanez): This can go away if the GN build can be upstreamed to the
# Pi Pico repo.
_CWD = "${PICO_SRC_DIR}/src/rp2_common/boot_stage2"
config("public_include_dirs") {
include_dirs = [
"${_CWD}/include",
"${_CWD}/asminclude",
]
}
pw_executable("boot_stage2_elf") {
_linker_script_path = rebase_path("${_CWD}/boot_stage2.ld", root_build_dir)
# Compile as position-independent.
cflags = [ "-fPIC" ]
asmflags = cflags
ldflags = cflags
ldflags += [
"-T${_linker_script_path}",
"-nostartfiles",
# Unfortunately, this is not properly applied to compiler flags thanks to
# `default_configs`.
"-Wl,--no-gc-sections",
]
public_configs = [ ":public_include_dirs" ]
# The upstream boot_stage2.ld doesn't specify the binary entry point or
# mark the required sections as KEEP(), so they're optimized out with
# Pigweed's aggressive default optimizations.
remove_configs = [
"$dir_pw_build:reduced_size",
"$dir_pw_build:strict_warnings",
]
no_link_deps = true
public = [ "${_CWD}/include/boot_stage2/config.h" ]
deps = [ "${PICO_ROOT}/src/common/pico_base" ]
# The correct assembly file is pulled in by compile_time_choice.S.
inputs = [
"${_CWD}/boot_stage2.ld",
"${_CWD}/boot2_at25sf128a.S",
"${_CWD}/boot2_generic_03h.S",
"${_CWD}/boot2_is25lp080.S",
"${_CWD}/boot2_usb_blinky.S",
"${_CWD}/boot2_w25q080.S",
"${_CWD}/boot2_w25x10cl.S",
]
sources = [ "${_CWD}/compile_time_choice.S" ]
}
pw_exec("boot_stage2_bin") {
_out_bin = "${target_out_dir}/boot_stage2.bin"
program = "arm-none-eabi-objcopy"
args = [
"-Obinary",
"<TARGET_FILE(:boot_stage2_elf)>",
rebase_path(_out_bin, root_build_dir),
]
outputs = [ _out_bin ]
deps = [ ":boot_stage2_elf" ]
}
pw_python_action("boot_stage2_padded") {
_src_bin = get_target_outputs(":boot_stage2_bin")
_out_asm = "${target_out_dir}/boot_stage2.S"
script = "${_CWD}/pad_checksum"
args = [
"-s",
"0xffffffff",
rebase_path(_src_bin[0], root_build_dir),
rebase_path(_out_asm, root_build_dir),
]
outputs = [ _out_asm ]
deps = [ ":boot_stage2_bin" ]
}
pw_source_set("boot_stage2_asm") {
deps = [ ":boot_stage2_padded" ]
sources = get_target_outputs(":boot_stage2_padded")
}
group("boot_stage2") {
public_deps = [
":boot_stage2_asm",
":boot_stage2_elf",
]
}
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