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Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
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uniLoader
*.o
asm/*.o
asm/linker.lds
board/*/*.o
soc/*/*.o

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The GNU General Public License (GPL-2.0)
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
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# SPDX-License-Identifier: GPL-2.0
#
# Defaut values
#
KERNEL_PATH?=blob/Image
DTB_PATH?=blob/dtb
#
# Compiler defines
#
CCPREFIX?=aarch64-linux-gnu-
CC=$(CCPREFIX)gcc
CPP=$(CCPREFIX)cpp
LD=$(CCPREFIX)ld
OBJCPY=$(CCPREFIX)objcopy
#
# Compiler flags
#
CFLAGS = -march=armv8-a -Wall -nodefaultlibs \
-nostdlib -nostartfiles -fno-builtin \
-nostdinc -Wstrict-prototypes -std=gnu11 \
-Wno-main -I'./include'
#
# Split BOARD definition into 2 parts - manufacturer and codename
#
split_board := $(subst -, ,$(BOARD:%=%))
board_manu := $(word 1,$(split_board))
board_codename := $(word 2,$(split_board))
OBJ = main.o \
asm/Start.o
.PHONY: clean
#
# Syntax:
# name: dependencies-in-order
# action-to-do
#
uniLoader: uniLoader.o
$(OBJCPY) -O binary $< $@
uniLoader.o: copy-board-config $(OBJ) asm/linker.lds build-board build-soc
$(LD) $(OBJ) board.o soc.o -o $@ --script=asm/linker.lds
asm/linker.lds: asm/linker.lds.S $(KERNEL_PATH)
$(CPP) $< -DKERNEL_PATH=$(KERNEL_PATH) -DDTB_PATH=$(DTB_PATH) -P -o $@
build-board:
cd board && make
build-soc:
cd soc && make
copy-board-config:
cp include/board/board-$(board_codename).h include/board-config.h
clean:
-rm *.o asm/linker.lds asm/Start.o uniLoader board/*/*.o include/board-config.h soc/*/*.o

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# uniLoader
A simple secondary bootloader that is capable of loading Linux for Android and iOS based devices.
# Building
1. Install aarch64-linux-gnu
2. ```git clone https://github.com/ivoszbg/uniLoader```
3. ```cd uniLoader```
4. Place your kernel and device tree blobs under blob/
5. ```make BOARD=(oem)-(board-codename) SOC=(device-soc)```<br />
# Building example
```sudo apt install aarch64-linux-gnu```<br />
```git clone https://github.com/ivoszbg/uniLoader```<br />
```cd uniLoader```<br />
```cp /home/user/linux/arch/arm64/boot/Image blob/Image```<br />
```cp /home/user/linux/arch/arm64/boot/dts/exynos/exynos8895-dreamlte.dtb blob/dtb```<br />
```make BOARD=samsung-dreamlte SOC=exynos8895```
# Usage
For Apple devices: Load the generated **uniLoader** binary via PongoOs (TODO: allow loading **instead** of PongoOs)<br /><br />
For Android devices: Replace the linux kernel in your *boot.img* with the **uniLoader** binary
# Credits
VDavid003 - for his sboot wrapper<br />
Quack723 - Contributor<br />
Ivoszbg - Making this huge mess of a bootloader
# License
This project is licensed under GPL2.

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
adr x0, dtb
adr x1, kernel
b main
.global load_kernel
load_kernel:
br x4

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
OUTPUT_FORMAT("elf64-littleaarch64")
OUTPUT_ARCH(aarch64)
TARGET(binary)
INPUT(KERNEL_PATH)
INPUT(DTB_PATH)
SECTIONS
{
.boot : {
asm/Start.o
}
.dtb ALIGN(0x1000) : {
dtb = .;
DTB_PATH
}
.kernel ALIGN(0x1000) : {
kernel = .;
KERNEL_PATH
}
}

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Folder for binary blobs, like kernel image and device tree.

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# SPDX-License-Identifier: GPL-2.0
#
# Compiler defines
#
CCPREFIX?=aarch64-linux-gnu-
CC=$(CCPREFIX)gcc
CPP=$(CCPREFIX)cpp
LD=$(CCPREFIX)ld
OBJCPY=$(CCPREFIX)objcopy
#
# Compiler flags
#
CFLAGS = -march=armv8-a -Wall -nodefaultlibs \
-nostdlib -nostartfiles -fno-builtin \
-nostdinc -Wstrict-prototypes -std=gnu11 -I'../include'
#
# Split BOARD definition into 2 parts - manufacturer and codename
#
split_board := $(subst -, ,$(BOARD:%=%))
board_manu := $(word 1,$(split_board))
board_codename := $(word 2,$(split_board))
all: $(board_manu)/board-$(board_codename).o copy-board
copy-board:
cp $(board_manu)/board-$(board_codename).o ../board.o

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
#include <board/board-dreamlte.h>
void board_init(void) {
}

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board-config.h

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
#ifndef BOARD_DREAMLTE_H_ /* Include guard */
#define BOARD_DREAMLTE_H_
#define PAYLOAD_ENTRY 0x90000000
#define PAYLOAD_SIZE 0x2000000
#endif // BOARD_DREAMLTE_H_

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
#ifndef MAIN_H_ /* Include guard */
#define MAIN_H_
extern void load_kernel(void* dtb, void* x1, void* x2, void* x3, void* kernel);
extern void soc_init(void);
extern void board_init(void);
/* Define our own 128 bit memcpy */
void memcpy(void *dest, void *src, int size)
{
unsigned __int128 *src2 = src;
unsigned __int128 *dest2 = dest;
for (int i=0; i<size/16; i++)
dest2[i] = src2[i];
}
#endif // MAIN_H_

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
#ifndef EXYNOS8895_H_ /* Include guard */
#define EXYNOS8895_H_
#define DECON_F_BASE 0x12860000
#define HW_SW_TRIG_CONTROL 0x70
#endif // EXYNOS8895_H_

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
#include <main.h>
/* Device specific board config, copied in runtime */
#include <board-config.h>
void main(void* dt, void* kernel) {
/* Initialize SoC and Board specific peripherals/quirks */
soc_init();
board_init();
/* Copy kernel to memory and boot */
memcpy((void*)PAYLOAD_ENTRY, kernel, PAYLOAD_SIZE);
load_kernel(dt, 0, 0, 0, (void*)PAYLOAD_ENTRY);
}

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# SPDX-License-Identifier: GPL-2.0
#
# Compiler defines
#
CCPREFIX?=aarch64-linux-gnu-
CC=$(CCPREFIX)gcc
CPP=$(CCPREFIX)cpp
LD=$(CCPREFIX)ld
OBJCPY=$(CCPREFIX)objcopy
#
# Compiler flags
#
CFLAGS = -march=armv8-a -Wall -nodefaultlibs \
-nostdlib -nostartfiles -fno-builtin \
-nostdinc -Wstrict-prototypes -std=gnu11 -I'../include'
#
# Split BOARD definition into 2 parts - manufacturer and codename
#
split_board := $(subst -, ,$(BOARD:%=%))
board_manu := $(word 1,$(split_board))
board_codename := $(word 2,$(split_board))
#
# Supported SoCs
#
# Exynos
ifeq ($(SOC),exynos8895)
brand_name=exynos
endif
all: $(brand_name)/$(SOC).o copy-soc
copy-soc:
cp $(brand_name)/$(SOC).o ../soc.o

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (c) 2022, Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
*/
#include <soc/exynos8895.h>
void soc_init(void) {
/* Allow framebuffer to be written to */
*(int*) (DECON_F_BASE + HW_SW_TRIG_CONTROL) = 0x1281;
}