最近在学习研究U-BOOT,自己摸索了几天，有点头绪，在这记录下，希望有研究barebox的兄弟一起探讨下，有不足之处请提出改正。
1.下载barebox最新源代码barebox-2011.11.0，解压后，在\barebox-2011.11.0\arch\arm\boards中复制mini2440文件夹并改名为tq2440(可以把不相关的文件夹删除)如下图：
2.对比mini2440和tq2440两个文件夹，把env文件夹下的config文件做如下修改：
再把kconfig文件对比修改如下：
makefile文件修改为：obj-y += tq2440.o lowlevel_init.o
把tq2440文件夹里的mini2440.c修改为tq2440.c并把其内容修改为：（也就是把里面的mini2440修改为tq2440）
/*
* Copyright (C) 2010 Marek Belisko <marek.belisko@open-nandra.com>
*
* Based on a9m2440.c board init by Juergen Beisert, Pengutronix
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
/**
* @file
* @brief mini2440 Specific Board Initialization routines
*
*/
#include <common.h>
#include <driver.h>
#include <init.h>
#include <generated/mach-types.h>
#include <partition.h>
#include <dm9000.h>
#include <nand.h>
#include <mci.h>
#include <fb.h>
#include <asm/armlinux.h>
#include <io.h>
#include <mach/gpio.h>
#include <mach/s3c24x0-iomap.h>
#include <mach/s3c24x0-nand.h>
#include <mach/s3c24xx-generic.h>
#include <mach/mci.h>
#include <mach/fb.h>
static struct s3c24x0_nand_platform_data nand_info = {
.nand_timing = CALC_NFCONF_TIMING(A9M2440_TACLS, A9M2440_TWRPH0, A9M2440_TWRPH1),
.flash_bbt = 1, /* same as the kernel */
};
/*
* dm9000 network controller onboard
* Connected to CS line 4 and interrupt line EINT7,
* data width is 16 bit
* Area 1: Offset 0x300...0x303
* Area 2: Offset 0x304...0x307
*/
static struct dm9000_platform_data dm9000_data = {
.srom = 1,
};
static struct s3c_mci_platform_data mci_data = {
.caps = MMC_MODE_4BIT | MMC_MODE_HS | MMC_MODE_HS_52MHz,
.voltages = MMC_VDD_32_33 | MMC_VDD_33_34,
.gpio_detect = 232, /* GPG8_GPIO */
.detect_invert = 0,
};
static struct fb_videomode s3c24x0_fb_modes[] = {
#ifdef CONFIG_TQ2440_VIDEO_N35
{
.name = "N35",
.refresh = 60,
.xres = 240,
.left_margin = 21,
.right_margin = 38,
.hsync_len = 6,
.yres = 320,
.upper_margin = 4,
.lower_margin = 4,
.vsync_len = 2,
.pixclock = 115913,
.sync = FB_SYNC_USE_PWREN,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
},
#endif
#ifdef CONFIG_TQ2440_VIDEO_A70
{
.name = "A70",
.refresh = 50,
.xres = 800,
.left_margin = 40,
.right_margin = 40,
.hsync_len = 48,
.yres = 480,
.upper_margin = 29,
.lower_margin = 3,
.vsync_len = 3,
.pixclock = 41848,
.sync = FB_SYNC_USE_PWREN | FB_SYNC_DE_HIGH_ACT,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
},
#endif
#ifdef CONFIG_TQ2440_VIDEO_SVGA
{
.name = "SVGA",
.refresh = 24,
.xres = 1024,
.left_margin = 1,
.right_margin = 2,
.hsync_len = 2,
.yres = 768,
.upper_margin = 200,
.lower_margin = 16,
.vsync_len = 16,
.pixclock = 40492,
.sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT | FB_SYNC_DE_HIGH_ACT
/* | FB_SYNC_SWAP_HW */ /* FIXME maybe */ ,
.vmode = FB_VMODE_NONINTERLACED,
.flag = 0,
},
#endif
};
static struct s3c_fb_platform_data s3c24x0_fb_data = {
.mode_list = s3c24x0_fb_modes,
.mode_cnt = sizeof(s3c24x0_fb_modes) / sizeof(struct fb_videomode),
.bits_per_pixel = 16,
.passive_display = 0,
};
static const unsigned pin_usage[] = {
/* address bus, used by NOR, SDRAM */
GPA1_ADDR16,
GPA2_ADDR17,
GPA3_ADDR18,
GPA4_ADDR19,
GPA5_ADDR20,
GPA6_ADDR21,
GPA7_ADDR22,
GPA8_ADDR23_GPIO | GPIO_IN,
GPA9_ADDR24, /* BA0 */
GPA10_ADDR25, /* BA1 */
GPA11_ADDR26_GPIO | GPIO_IN, /* not connected */
/* DM9000 requirements */
GPA15_NGCS4,
GPF7_EINT7,
/* de-activate the speaker */
GPB0_GPIO | GPIO_OUT | GPIO_VAL(0),
/* SD socket */
GPE5_SDCLK,
GPE6_SDCMD,
GPE7_SDDAT0,
GPE8_SDDAT1,
GPE9_SDDAT2,
GPE10_SDDAT3,
GPG8_GPIO | GPIO_IN, /* change detection */
GPH8_GPIO | GPIO_IN, /* write protection sense */
/* NAND requirements */
GPA17_CLE,
GPA18_ALE,
GPA19_NFWE,
GPA20_NFRE,
GPA21_NRSTOUT,
GPA22_NFCE,
/* Video out */
GPC0_LEND,
GPC1_VCLK,
GPC2_VLINE,
GPC3_VFRAME,
GPC4_VM,
GPC5_LPCOE,
GPC6_LPCREV,
GPC7_LPCREVB,
GPG4_LCD_PWREN,
GPC8_VD0,
GPC9_VD1,
GPC10_VD2,
GPC11_VD3,
GPC12_VD4,
GPC13_VD5,
GPC14_VD6,
GPC15_VD7,
GPD0_VD8,
GPD1_VD9,
GPD2_VD10,
GPD3_VD11,
GPD4_VD12,
GPD5_VD13,
GPD6_VD14,
GPD7_VD15,
GPD8_VD16,
GPD9_VD17,
GPD10_VD18,
GPD11_VD19,
GPD12_VD20,
GPD13_VD21,
GPD14_VD22,
GPD15_VD23,
/* K6 or CON12, pin 6, external pull up */
GPG11_EINT19 | GPIO_IN,
/* K5 or CON12, pin 5*/
GPG7_EINT15 | GPIO_IN,
/* K4 or CON12, pin 4 */
GPG6_EINT14 | GPIO_IN,
/* K3 or CON12, pin 3 */
GPG5_EINT13 | GPIO_IN,
/* K2 or CON12, pin 2 */
GPG3_EINT11 | GPIO_IN,
/* K1 or CON12, pin 1, external pull up */
GPG0_EINT8 | GPIO_IN,
/* LED 1 1=off */
GPB5_GPIO | GPIO_OUT | GPIO_VAL(1),
/* LED 2 1=off */
GPB6_GPIO | GPIO_OUT | GPIO_VAL(1),
/* LED 3 1=off */
GPB7_GPIO | GPIO_OUT | GPIO_VAL(1),
/* LED 4 1=off */
GPB8_GPIO | GPIO_OUT | GPIO_VAL(1),
/* camera interface (ignore it) */
GPJ0_GPIO | GPIO_IN,
GPJ1_GPIO | GPIO_IN,
GPJ2_GPIO | GPIO_IN,
GPJ3_GPIO | GPIO_IN,
GPJ4_GPIO | GPIO_IN,
GPJ5_GPIO | GPIO_IN,
GPJ6_GPIO | GPIO_IN,
GPJ7_GPIO | GPIO_IN,
GPJ8_GPIO | GPIO_IN,
GPJ9_GPIO | GPIO_IN,
GPJ10_GPIO | GPIO_IN,
GPJ11_GPIO | GPIO_IN,
GPJ12_GPIO | GPIO_IN,
/* I2C bus */
GPE14_IICSCL, /* external pull up */
GPE15_IICSDA, /* external pull up */
GPA12_NGCS1, /* CON5, pin 7 */
GPA13_NGCS2, /* CON5, pin 8 */
GPA14_NGCS3, /* CON5, pin 9 */
GPA16_NGCS5, /* CON5, pin 10 */
/* UART2 (spare) */
GPH4_TXD1,
GPH5_RXD1,
/* UART3 (spare) */
GPH6_TXD2,
GPH7_RXD2,
};
static int tq2440_mem_init(void)
{
arm_add_mem_device("ram0", CS6_BASE, s3c24x0_get_memory_size());
return 0;
}
mem_initcall(tq2440_mem_init);
static int tq2440_devices_init(void)
{
uint32_t reg;
int i;
/* ----------- configure the access to the outer space ---------- */
for (i = 0; i < ARRAY_SIZE(pin_usage); i++)
s3c_gpio_mode(pin_usage[i]);
reg = readl(BWSCON);
/* CS#4 to access the network controller */
reg &= ~0x000f0000;
reg |= 0x000d0000; /* 16 bit */
writel(0x1f4c, BANKCON4);
writel(reg, BWSCON);
/* release the reset signal to external devices */
reg = readl(MISCCR);
reg |= 0x10000;
writel(reg, MISCCR);
add_generic_device("s3c24x0_nand", -1, NULL, S3C24X0_NAND_BASE, 0,
IORESOURCE_MEM, &nand_info);
add_dm9000_device(0, CS4_BASE + 0x300, CS4_BASE + 0x304,
IORESOURCE_MEM_16BIT, &dm9000_data);
#ifdef CONFIG_NAND
/* ----------- add some vital partitions -------- */
devfs_del_partition("self_raw");
devfs_add_partition("nand0", 0x00000, 0x40000, PARTITION_FIXED, "self_raw");
dev_add_bb_dev("self_raw", "self0");
devfs_del_partition("env_raw");
devfs_add_partition("nand0", 0x40000, 0x20000, PARTITION_FIXED, "env_raw");
dev_add_bb_dev("env_raw", "env0");
#endif
add_generic_device("s3c_mci", 0, NULL, S3C2410_SDI_BASE, 0,
IORESOURCE_MEM, &mci_data);
add_generic_device("s3c_fb", 0, NULL, S3C2410_LCD_BASE, 0,
IORESOURCE_MEM, &s3c24x0_fb_data);
armlinux_set_bootparams((void*)CS6_BASE + 0x100);
armlinux_set_architecture(MACH_TYPE_TQ2440);
return 0;
}
device_initcall(tq2440_devices_init);
#ifdef CONFIG_S3C24XX_NAND_BOOT
void __bare_init nand_boot(void)
{
s3c24x0_nand_load_image((void *)TEXT_BASE, 256 * 1024, 0);
}
#endif
static int tq2440_console_init(void)
{
/*
* configure the UART1 right now, as barebox will
* start to send data immediately
*/
s3c_gpio_mode(GPH0_NCTS0);
s3c_gpio_mode(GPH1_NRTS0);
s3c_gpio_mode(GPH2_TXD0);
s3c_gpio_mode(GPH3_RXD0);
add_generic_device("s3c24x0_serial", -1, NULL, UART1_BASE, UART1_SIZE,
IORESOURCE_MEM, NULL);
return 0;
}
console_initcall(tq2440_console_init);
/** @page mini2440 FriendlyARM's mini2440
This system is based on a Samsung S3C2440 CPU. The card is shipped with:
- S3C2440\@400 MHz or 533 MHz (ARM920T/ARMv4T)
- 12 MHz crystal reference
- 32.768 kHz crystal reference
- SDRAM 64 MiB (one bank only)
- HY57V561620 (two devices for 64 MiB to form a 32 bit bus)
- 4M x 16bit x 4 Banks Mobile SDRAM
- 8192 refresh cycles / 64 ms
- CL2\@100 MHz
- 133 MHz max
- collumn address size is 9 bits
- row address size is 13 bits
- MT48LC16M16 (two devices for 64 MiB to form a 32 bit bus)
- 4M x 16bit x 4 Banks Mobile SDRAM
- commercial & industrial type
- 8192 refresh cycles / 64 ms
- CL2\@100 MHz
- 133 MHz max
- collumn address size is 9 bits
- row address size is 13 bits
- NAND Flash 128MiB...1GiB
- K9Fxx08
- NOR Flash (up to 22 address lines available)
- AM29LV160DB, 2 MiB
- SST39VF1601, 2 MiB
- 16 bit data bus
- SD card interface, 3.3V (fixed voltage)
- Host and device USB interface, USB1.1 compliant
- UDA1341TS Audio
- DM9000 Ethernet interface
- uses CS#4
- uses EINT7
- 16 bit data bus
- I2C interface, 100 KHz and 400 KHz
- EEPROM
- ST M24C08
- address 0x50
- Speaker on GPB0 ("low" = inactive)
- LCD interface
- Touch Screen interface
- Camera interface
- I2S interface
- AC97 Audio-CODEC interface
- three serial RS232 interfaces (one with level converter)
- SPI interface
- JTAG interface
How to get the binary image:
Using the default configuration:
@code
make ARCH=arm mini2440_defconfig
@endcode
Build the binary image:
@code
make ARCH=arm CROSS_COMPILE=armv4compiler
@endcode
@note replace the armv4compiler with your ARM v4 cross compiler.
How to bring in \a barebox ?
First run it as a second stage bootloader. There are two known working ways to
do so:
One way is to use the "device firmware update" feature of the 'supervivi'.
- connect a terminal application to the mini2440's serial connector
- switch S2 to 'boot from NOR' to boot into 'supervivi'
- connect your host to the usb device connector on the mini2440
- switch on your mini2440
- in 'supervivi' type q (command line) then:
@code
load ram 0x31000000 \<barebox-size\> u
@endcode
- use a tool for DFU update (for example from openkomo) to transfer the 'barebox.bin' binary
- then in 'supervivi' just run
@code
go 0x31000000
@endcode
A second way is to use any kind of JTAG adapter. For this case I'm using the
'JTAKkey tiny' from Amontec and OpenOCD. First you need an adapter for this
kind of Dongle as it uses a 20 pin connector with 2.54 mm grid, and the
mini2440 uses a 10 pin connector with 2 mm grid.
@code
Amontec JTAGkey tiny mini2440
-------------------------------------------------------
VREF 1 2 n.c. VREF 1 2 VREF
TRST_N 3 4 GND TRST_N 3 4 SRST_N
TDI 5 6 GND TDI 5 6 TDO
TMS 7 8 GND TMS 7 8 GND
TCK 9 10 GND TCK 9 10 GND
n.c. 11 12 GND
TDO 13 14 GND
SRST_N 15 16 GND
n.c. 17 18 GND
n.c. 19 20 GND
@endcode
Create a simple board description file. I did it this way:
@code
source [find interface/jtagkey-tiny.cfg]
source [find target/samsung_s3c2440.cfg]
adapter_khz 12000
@endcode
And then the following steps:
- connect a terminal application to the mini2440's serial connector
- connect the mini2440 to a working network
- switch S2 to boot from NOR to boot into 'supervivi'
- switch on your mini2440
- run the OpenOCD daemon configured with the file shown above
- connect to the OpenOCD daemon via 'telnet'.
- run the following commands to download @a barebox into your target
@code
> halt
> load_image \<path to the 'barebox.bin'\> 0x31000000 bin
> resume 0x31000000
@endcode
Now @a barebox is starting from an already initialized CPU and SDRAM (done by
'supervivi').
Change to your terminal console and configure the network first. Adapt the
following settings to your network:
@code
eth0.ipaddr=192.168.1.240
eth0.netmask=255.255.255.0
eth0.gateway=192.168.23.2
eth0.serverip=192.168.1.7
eth0.ethaddr=00:04:f3:00:06:35
@endcode
A 'ping' to your TFTP server should bring a "...is alive" message now.
We are ready now to program @a barebox into the NAND flash:
@code
erase /dev/nand0.barebox.bb
tftp barebox.bin /dev/nand0.barebox.bb
@endcode
*/
3.在\arch\arm下的makefile文件中的位置board-$(CONFIG_MACH_MINI2440) := mini2440下增加代码：board-$(CONFIG_MACH_TQ2440) := tq2440
board-$(CONFIG_MACH_MINI2440):= mini2440
board-$(CONFIG_MACH_TQ2440) := tq2440
4.复制\arch\arm\configs下的文件mini2440_defconfig修改为tq2440_defconfig并修改器内容：把CONFIG_MACH_MINI2440=y修改为CONFIG_MACH_TQ2440=y， b把CONFIG_DEFAULT_ENVIRONMENT_PATH="arch/arm/boards/mini2440/env"修改为CONFIG_DEFAULT_ENVIRONMENT_PATH="arch/arm/boards/tq2440/env"并拷贝到根目录（barebox-2011.11.0/）下；
CONFIG_ARCH_S3C24xx=y
CONFIG_MACH_TQ2440=y
CONFIG_S3C24XX_NAND_BOOT=y
CONFIG_AEABI=y
CONFIG_ARM_OPTIMZED_STRING_FUNCTIONS=y
CONFIG_TEXT_BASE=0x33e00000
CONFIG_BROKEN=y
CONFIG_PROMPT="tq2440:"
CONFIG_LONGHELP=y
CONFIG_GLOB=y
CONFIG_CMDLINE_EDITING=y
CONFIG_AUTO_COMPLETE=y
CONFIG_PARTITION=y
CONFIG_DEFAULT_ENVIRONMENT_GENERIC=y
CONFIG_DEFAULT_ENVIRONMENT_PATH="arch/arm/boards/tq2440/env"
CONFIG_DEBUG_INFO=y
CONFIG_CMD_EDIT=y
CONFIG_CMD_SLEEP=y
CONFIG_CMD_SAVEENV=y
CONFIG_CMD_LOADENV=y
CONFIG_CMD_EXPORT=y
CONFIG_CMD_PRINTENV=y
CONFIG_CMD_READLINE=y
CONFIG_CMD_MEMINFO=y
CONFIG_CMD_MTEST=y
CONFIG_CMD_FLASH=y
CONFIG_CMD_RESET=y
CONFIG_CMD_GO=y
CONFIG_CMD_TIMEOUT=y
CONFIG_CMD_PARTITION=y
CONFIG_CMD_GPIO=y
CONFIG_NET=y
CONFIG_NET_DHCP=y
CONFIG_NET_PING=y
CONFIG_NET_TFTP=y
CONFIG_DRIVER_NET_DM9000=y
# CONFIG_SPI is not set
CONFIG_MCI=y
CONFIG_MCI_S3C=y
5.在文件夹\arch\arm\mach-s3c24xx下的kconfig文件的代码source arch/arm/boards/mini2440/Kconfig 下增加source arch/arm/boards/tq2440/Kconfig代码；
在代码
config MACH_MINI2440
bool "Mini 2440"
select CPU_S3C2440
select MACH_HAS_LOWLEVEL_INIT
select MACH_DO_LOWLEVEL_INIT
select S3C24XX_PLL_INIT
select S3C24XX_SDRAM_INIT
select HAS_DM9000
help
Say Y here if you are using Mini 2440 dev board equipped
with a Samsung S3C2440 Processor
后增加代码：
config MACH_TQ2440
bool "TQ 2440"
select CPU_S3C2440
select MACH_HAS_LOWLEVEL_INIT
select MACH_DO_LOWLEVEL_INIT
select S3C24XX_PLL_INIT
select S3C24XX_SDRAM_INIT
select HAS_DM9000
help
Say Y here if you are using tq 2440 dev board equipped
with a Samsung S3C2440 Processor