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m68k: Add support for M68040 CPU

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Add support for the Motorola 68040 architecture. Currently, m68k
support in U-Boot is primarily focused on ColdFire variants. Introduce
the necessary infrastructure to support the classic M680x0 series,
specifically targeting the M68040 as emulated by QEMU.

The implementation includes exception vectors, early startup code, and
minimal CPU initialization and relocation stubs. It also defines the
standard m68k boot information structure used for passing hardware
information to the operating system. To ensure compatibility, ColdFire-
specific library objects such as cache and interrupt handling are
excluded from the build when M68040 is selected.

Additionally, apply a specific workaround during the early memory
reservation stage. Use a manual loop to clear global data instead of
the standard memset() function, as utilizing memset() at this point was
observed to cause a hang on the QEMU platform.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Acked-by: Angelo Dureghello <angelo@kernel-space.org>
Reviewed-by: Simon Glass <simon.glass@canonical.com>
This commit is contained in:
Kuan-Wei Chiu
2026-01-07 20:18:34 +00:00
committed by Tom Rini
parent 0429298a1a
commit c69b6aeaa3
10 changed files with 284 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
MAINTAINERS
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@@ -1324,6 +1324,12 @@ F: lib/getopt.c
F: test/log/
F: test/py/tests/test_log.py
M680X0 ARCHITECTURE
M: Kuan-Wei Chiu <visitorckw@gmail.com>
S: Maintained
F: arch/m68k/cpu/m680x0/
F: arch/m68k/include/asm/bootinfo.h
MALI DISPLAY PROCESSORS
M: Liviu Dudau <liviu.dudau@foss.arm.com>
S: Supported

30
arch/m68k/Kconfig
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@@ -12,50 +12,64 @@ config MCF520x
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config MCF52x2
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config MCF523x
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config MCF530x
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config MCF5301x
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config MCF532x
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config MCF537x
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config MCF5441x
select OF_CONTROL
select DM
select DM_SERIAL
select ARCH_COLDFIRE
bool
config M680x0
bool
help
This enables support for the classic Motorola 68000 family of
processors.
# processor type
config M5208
bool
@@ -110,6 +124,10 @@ config M54418
bool
select MCF5441x
config M68040
bool
select M680x0
# peripherals
config CF_DSPI
bool
@@ -178,6 +196,18 @@ config TARGET_STMARK2
endchoice
config SYS_CPU
string
default "mcf52x2" if MCF52x2
default "mcf523x" if MCF523x
default "mcf530x" if MCF530x
default "mcf532x" if MCF532x
default "mcf5445x" if MCF5445x
default "m680x0" if M680x0
config ARCH_COLDFIRE
bool
source "board/BuS/eb_cpu5282/Kconfig"
source "board/cobra5272/Kconfig"
source "board/freescale/m5208evbe/Kconfig"

1
arch/m68k/Makefile
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@@ -17,6 +17,7 @@ cpuflags-$(CONFIG_M5307) := -mcpu=5307
cpuflags-$(CONFIG_MCF5301x) := -mcpu=53015 -fPIC
cpuflags-$(CONFIG_MCF532x) := -mcpu=5329 -fPIC
cpuflags-$(CONFIG_MCF5441x) := -mcpu=54418 -fPIC
cpuflags-$(CONFIG_M68040) := -mcpu=68040 -fno-pic
PLATFORM_CPPFLAGS += $(cpuflags-y)

10
arch/m68k/config.mk
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@@ -3,8 +3,14 @@
# (C) Copyright 2000-2002
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
PLATFORM_CPPFLAGS += -D__M68K__ -fPIC
PLATFORM_CPPFLAGS += -D__M68K__
ifneq ($(CONFIG_M680x0),y)
PLATFORM_CPPFLAGS += -fPIC
endif
KBUILD_LDFLAGS += -n -pie
PLATFORM_RELFLAGS += -ffunction-sections -fdata-sections
PLATFORM_RELFLAGS += -ffixed-d7 -msep-data
PLATFORM_RELFLAGS += -ffixed-d7
ifneq ($(CONFIG_M680x0),y)
PLATFORM_RELFLAGS += -msep-data
endif
LDFLAGS_FINAL += --gc-sections -pie

6
arch/m68k/cpu/m680x0/Makefile Normal file
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@@ -0,0 +1,6 @@
# SPDX-License-Identifier: GPL-2.0-or-later
#
# Copyright (C) 2025, Kuan-Wei Chiu <visitorckw@gmail.com>
extra-y += start.o
obj-y += cpu.o

73
arch/m68k/cpu/m680x0/cpu.c Normal file
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@@ -0,0 +1,73 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* CPU specific code for m68040
*
* Copyright (C) 2025, Kuan-Wei Chiu <visitorckw@gmail.com>
*/
#include <config.h>
#include <cpu_func.h>
#include <init.h>
#include <stdio.h>
#include <asm/global_data.h>
#include <linux/types.h>
DECLARE_GLOBAL_DATA_PTR;
void m68k_virt_init_reserve(ulong base)
{
struct global_data *gd_ptr = (struct global_data *)base;
char *p = (char *)gd_ptr;
unsigned int i;
/* FIXME: usage of memset() here caused a hang on QEMU m68k virt. */
for (i = 0; i < sizeof(*gd_ptr); i++)
p[i] = 0;
gd = gd_ptr;
gd->malloc_base = base + sizeof(*gd_ptr);
}
int print_cpuinfo(void)
{
puts("CPU: M68040 (QEMU Virt)\n");
return 0;
}
int get_clocks(void)
{
return 0;
}
int cpu_init_r(void)
{
return 0;
}
/*
* Relocation Stub
* We skip actual relocation for this QEMU bring-up and jump directly
* to board_init_r.
*/
void relocate_code(ulong sp, struct global_data *new_gd, ulong relocaddr)
{
board_init_r(new_gd, relocaddr);
}
/* Stubs for Standard Facilities (Cache, Interrupts) */
int disable_interrupts(void) { return 0; }
void enable_interrupts(void) { return; }
int interrupt_init(void) { return 0; }
void icache_enable(void) {}
void icache_disable(void) {}
int icache_status(void) { return 0; }
void dcache_enable(void) {}
void dcache_disable(void) {}
int dcache_status(void) { return 0; }
void flush_cache(unsigned long start, unsigned long size) {}
void flush_dcache_range(unsigned long start, unsigned long stop) {}

73
arch/m68k/cpu/m680x0/start.S Normal file
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@@ -0,0 +1,73 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Startup code for m68040
*
* Copyright (C) 2025, Kuan-Wei Chiu <visitorckw@gmail.com>
*/
#include <asm-offsets.h>
#include <config.h>
#include <linux/linkage.h>
.section .text
/*
* Vector Table
* m68k uses the first 1KB for the exception vector table.
*/
.balign 4
.global _vectors
_vectors:
.long CFG_SYS_INIT_SP_ADDR /* 0x00: Initial SP */
.long _start /* 0x04: Initial PC (Reset) */
.long _fault /* 0x08: Bus Error */
.long _fault /* 0x0C: Address Error */
.long _fault /* 0x10: Illegal Instruction */
.long _fault /* 0x14: Zero Divide */
.long _fault /* 0x18: CHK */
.long _fault /* 0x1C: TRAPV */
.long _fault /* 0x20: Privilege */
.long _fault /* 0x24: Trace */
.long _fault /* 0x28: Line 1010 */
.long _fault /* 0x2C: Line 1111 */
.fill 0x400 - (.-_vectors), 1, 0
/*
* Entry Point
*/
ENTRY(_start)
/* Disable Interrupts */
move.w #0x2700, %sr
/* Setup initial stack pointer */
move.l #CFG_SYS_INIT_SP_ADDR, %sp
/*
* Allocate Global Data (GD)
* board_init_f_alloc_reserve(top) returns the new top of stack in %d0
*/
move.l %sp, -(%sp)
bsr.l board_init_f_alloc_reserve
addq.l #4, %sp
/* Update Stack Pointer and set GD register */
move.l %d0, %sp
move.l %d0, %d7 /* %d7 is the gd register */
/* Initialize Reserved Memory. */
move.l %d0, -(%sp)
bsr.l m68k_virt_init_reserve
addq.l #4, %sp
/* Enter board_init_f(0) */
clr.l -(%sp)
bsr.l board_init_f
addq.l #4, %sp
/* Should not return */
hang:
bra.s hang
ENDPROC(_start)
_fault:
bra.s _fault

47
arch/m68k/cpu/m680x0/u-boot.lds Normal file
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@@ -0,0 +1,47 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Linker Script for m68040
*
* Copyright (C) 2025, Kuan-Wei Chiu <visitorckw@gmail.com>
*/
OUTPUT_ARCH(m68k)
ENTRY(_start)
SECTIONS
{
. = 0x00000000;
__text_start = .;
.text :
{
arch/m68k/cpu/m680x0/start.o (.text*)
*(.text*)
}
. = ALIGN(16);
.rodata : { *(.rodata*) }
. = ALIGN(16);
.data : { *(.data*) }
. = ALIGN(4);
.u_boot_list : {
KEEP(*(SORT(*u_boot_list*)));
}
. = ALIGN(4);
__image_copy_end = .;
__init_end = .;
. = ALIGN(16);
__bss_start = .;
.bss :
{
*(.bss*)
. = ALIGN(16);
}
__bss_end = .;
_end = .;
}

39
arch/m68k/include/asm/bootinfo.h Normal file
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@@ -0,0 +1,39 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2025, Kuan-Wei Chiu <visitorckw@gmail.com>
*
* Definitions for the m68k bootinfo interface.
*/
#ifndef _ASM_M68K_BOOTINFO_H
#define _ASM_M68K_BOOTINFO_H
#ifndef __ASSEMBLY__
struct bi_record {
unsigned short tag; /* tag ID */
unsigned short size; /* size of record (in bytes) */
unsigned long data[0]; /* data */
};
#endif /* __ASSEMBLY__ */
/* Bootinfo Tag IDs */
#define BI_LAST 0x0000
#define BI_MACHTYPE 0x0001
#define BI_CPUTYPE 0x0002
#define BI_FPUTYPE 0x0003
#define BI_MMUTYPE 0x0004
#define BI_MEMCHUNK 0x0005
#define BI_RAMDISK 0x0006
#define BI_COMMAND_LINE 0x0007
/* QEMU virt specific tags */
#define BI_VIRT_QEMU_VERSION 0x8000
#define BI_VIRT_GF_PIC_BASE 0x8001
#define BI_VIRT_GF_RTC_BASE 0x8002
#define BI_VIRT_GF_TTY_BASE 0x8003
#define BI_VIRT_VIRTIO_BASE 0x8004
#define BI_VIRT_CTRL_BASE 0x8005
#endif /* _ASM_M68K_BOOTINFO_H */

7
arch/m68k/lib/Makefile
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@@ -7,10 +7,5 @@
## if the user asked for it
lib-$(CONFIG_USE_PRIVATE_LIBGCC) += lshrdi3.o muldi3.o ashldi3.o ashrdi3.o
obj-y += bdinfo.o
obj-$(CONFIG_CMD_BOOTM) += bootm.o
obj-y += cache.o
obj-y += interrupts.o
obj-y += time.o
obj-y += traps.o
obj-y += fec.o
obj-$(CONFIG_ARCH_COLDFIRE) += cache.o interrupts.o time.o traps.o bdinfo.o fec.o