add build script and gitignore

.gitignore

+*.bin
+*.o
+*.cmd
+*.su
+*.lex.c
+*.tab.c
+*.tab.h
+*.tmp
+*.dtb
+System.map
+.binman_stamp
+.config
+.config.old
+lib/asm-offsets.s
+u-boot
+u-boot-elf.lds
+u-boot.cfg
+u-boot.cfg.configs
+u-boot.elf
+u-boot.lds
+u-boot.map
+u-boot.srec
+u-boot.sym
+include/config/
+include/generated/
+atf/
+arch/arm/lib/asm-offsets.s
+arch/arm/lib/lib.a

.gitlab-ci.yml

+image: debian:bookworm
+
+build:
+  script: |
+    set -exu
+    apt-get update
+    apt-get --yes install --no-install-recommends gcc-aarch64-linux-gnu build-essential bison flex device-tree-compiler git ca-certificates libssl-dev
+    ./build.sh
+  artifacts:
+    paths:
+      - flash.bin

build.sh

+#!/bin/bash
+
+set -exu
+
+export CROSS_COMPILE=aarch64-linux-gnu-
+export ARCH=arm64
+export LDFLAGS=--no-warn-rwx-segments
+
+# build Reset Configuration Word
+cd rcw/ls1028a-mnt-reform2
+make
+cd ../..
+
+# build u-boot
+# TODO: customize dts/config
+# TODO: what about the gpio settings at boot?
+make ls1028ardb_tfa_defconfig
+make -j$(nproc)
+
+# build ARM Trusted Firmware
+git clone https://source.mnt.re/reform/reform-ls1028a-atf.git atf
+
+export DDR_BIST=no
+export DDR_DEBUG=yes
+export DDR_PHY_DEBUG=yes
+
+cd atf
+make -j$(nproc) PLAT=ls1028ardb fip pbl BOOT_MODE=sd RCW=../rcw/ls1028a-mnt-reform2/R_PSPH_0xb8be/rcw_1500_sdboot.bin BL33=../u-boot-dtb.bin
+cd ..
+
+cp atf/build/ls1028ardb/release/bl2_sd.pbl ./flash.bin