AM335X-启动SD卡制作

1. AM335X启动配置

矿板SYSBOOT位配置信息,在矿板反面ANTMINER丝印上方,使用电阻焊接与否来替代拨码开关,矿板默认配置表如下

15 14 13 12 11 10 9 8
R55 R56 R57 R58 R59 R60 R61 R62
0 1 0 0 0 0 1 0
7 6 5 4 3 2 1 0
R63 R64 R65 R66 R67 R68 R69 R70
0 0 0 1 0 0 1 1

然后参照AM335x Sitara Processors Technical Reference Manual得出矿板默认的启动优先级(截图有剪裁)
AM335X-启动SD卡制作

2. 擦除NAND上的镜像

从默认启动配置可以看出,nand flash启动优先级高于mmc0和uart0,正常情况下的矿板都是带程序的
如果能进uboot,可以使用以下指令擦除nand:
nand erase.chip

如果不能中断uboot引导过程,或者上电不输出ccccc(xmodem1K的标识),则可能是nand flash中的mlo或uboot损坏
可以通过短接nand flash上的相关引脚来干扰默认启动过程,进而跳到mmc0或者uart0启动
但首要前提,矿板PMIC(TPS65217C)各路电压都正常,晶振0.8V左右,核心1.1V都要有。
短接下图任一红色方框中,任意两个引脚,然后再通电启动即可破坏默认的NAND优先启动方式,跳转到mmc0或者uart0启动。
AM335X-启动SD卡制作

3. 格式化TF卡

我使用的windows系统,因此使用DiskGenius来格式化TF卡
首先删除TF卡内原有的分区(如果TF卡内有其他资料,需要提前备份),这里我使用的是一张拓容卡,所以请不要吐槽这个容量
AM335X-启动SD卡制作

新建一个FAT32分区,参数这里改不了,默认即可,然后点击保存更改
AM335X-启动SD卡制作

先不要格式化,右键刚才创建的分区
AM335X-启动SD卡制作

系统标识改成0B
AM335X-启动SD卡制作

最后格式化刚才创建的分区,拷入一级引导MLOuboot.img
AM335X-启动SD卡制作

将TF卡插入矿板卡槽,上电启动,完成。
AM335X-启动SD卡制作

如果是linux用户,挂在tf卡后直接执行下面的bash脚本即可,复制下面的脚本,存储为.sh文件

#!/bin/bash
# Authors:
#    LT Thomas <ltjr@ti.com>
#    Chase Maupin
#    Franklin Cooper Jr.
#
# create-sdcard.sh v0.3

# Force locale language to be set to English. This avoids issues when doing
# text and string processing.
export LANG=C

# Determine the absolute path to the executable
# EXE will have the PWD removed so we can concatenate with the PWD safely
PWD=`pwd`
EXE=`echo $0 | sed s=$PWD==`
EXEPATH="$PWD"/"$EXE"
clear
cat << EOM

################################################################################

This script will create a bootable SD card from custom or pre-built binaries.

The script must be run with root permissions and from the bin directory of
the SDK

Example:
 $ sudo ./create-sdcard.sh path/to/sdcard/files

Formatting can be skipped if the SD card is already formatted and
partitioned properly.

################################################################################

EOM

AMIROOT=`whoami | awk {‘print $1‘}`
if [ "$AMIROOT" != "root" ] ; then

	echo "	**** Error *** must run script with sudo"
	echo ""
	exit
fi

THEPWD=$EXEPATH

check_for_sdcards()
{
        # find the avaible SD cards
        ROOTDRIVE=`mount | grep ‘on / ‘ | awk {‘print $1‘} |  cut -c6-8`
        PARTITION_TEST=`cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘`
        if [ "$PARTITION_TEST" = "" ]; then
	        echo -e "Please insert a SD card to continue\n"
	        while [ "$PARTITION_TEST" = "" ]; do
		        read -p "Type ‘y‘ to re-detect the SD card or ‘n‘ to exit the script: " REPLY
		        if [ "$REPLY" = ‘n‘ ]; then
		            exit 1
		        fi
		        ROOTDRIVE=`mount | grep ‘on / ‘ | awk {‘print $1‘} |  cut -c6-8`
		        PARTITION_TEST=`cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘`
	        done
        fi
}

# find the avaible SD cards
ROOTDRIVE=`mount | grep ‘on / ‘ | awk {‘print $1‘} |  cut -c6-9`
if [ "$ROOTDRIVE" = "root" ]; then
    ROOTDRIVE=`readlink /dev/root | cut -c1-3`
else
    ROOTDRIVE=`echo $ROOTDRIVE | cut -c1-3`
fi

PARTITION_TEST=`cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘`

# Check for available mounts
check_for_sdcards

echo -e "\nAvailable Drives to write images to: \n"
echo "#  major   minor    size   name "
cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘
echo " "

DEVICEDRIVENUMBER=
while true;
do
	read -p ‘Enter Device Number or ‘n‘ to exit: ‘ DEVICEDRIVENUMBER
	echo " "
        if [ "$DEVICEDRIVENUMBER" = ‘n‘ ]; then
                exit 1
        fi

        if [ "$DEVICEDRIVENUMBER" = "" ]; then
                # Check to see if there are any changes
                check_for_sdcards
                echo -e "These are the Drives available to write images to:"
                echo "#  major   minor    size   name "
                cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘
                echo " "
               continue
        fi

	DEVICEDRIVENAME=`cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘ | grep "${DEVICEDRIVENUMBER}:" | awk ‘{print $5}‘`
	if [ -n "$DEVICEDRIVENAME" ]
	then
	        DRIVE=/dev/$DEVICEDRIVENAME
	        DEVICESIZE=`cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘ | grep "${DEVICEDRIVENUMBER}:" | awk ‘{print $4}‘`
		break
	else
		echo -e "Invalid selection!"
                # Check to see if there are any changes
                check_for_sdcards
                echo -e "These are the only Drives available to write images to: \n"
                echo "#  major   minor    size   name "
                cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<sd.\>\|\<mmcblk.\>‘ | grep -n ‘‘
                echo " "
	fi
done

echo "$DEVICEDRIVENAME was selected"
#Check the size of disk to make sure its under 16GB
if [ $DEVICESIZE -gt 17000000 ] ; then
cat << EOM

################################################################################

		**********WARNING**********

	Selected Device is greater then 16GB
	Continuing past this point will erase data from device
	Double check that this is the correct SD Card

################################################################################

EOM
	ENTERCORRECTLY=0
	while [ $ENTERCORRECTLY -ne 1 ]
	do
		read -p ‘Would you like to continue [y/n] : ‘ SIZECHECK
		echo ""
		echo " "
		ENTERCORRECTLY=1
		case $SIZECHECK in
		"y")  ;;
		"n")  exit;;
		*)  echo "Please enter y or n";ENTERCORRECTLY=0;;
		esac
		echo ""
	done

fi
echo ""

DRIVE=/dev/$DEVICEDRIVENAME
NUM_OF_DRIVES=`df | grep -c $DEVICEDRIVENAME`

# This if statement will determine if we have a mounted sdX or mmcblkX device.
# If it is mmcblkX, then we need to set an extra char in the partition names, ‘p‘,
# to account for /dev/mmcblkXpY labled partitions.
if [[ ${DEVICEDRIVENAME} =~ ^sd. ]]; then
	echo "$DRIVE is an sdx device"
	P=‘‘
else
	echo "$DRIVE is an mmcblkx device"
	P=‘p‘
fi

if [ "$NUM_OF_DRIVES" != "0" ]; then
        echo "Unmounting the $DEVICEDRIVENAME drives"
        for ((c=1; c<="$NUM_OF_DRIVES"; c++ ))
        do
                unmounted=`df | grep ‘\<‘$DEVICEDRIVENAME$P$c‘\>‘ | awk ‘{print $1}‘`
                if [ -n "$unmounted" ]
                then
                     echo " unmounted ${DRIVE}$P$c"
                     sudo umount -f ${DRIVE}$P$c
                fi

        done
        echo " unmounted ${DRIVE}$P"
        sudo umount -f ${DRIVE}$P
else
        echo " unmounted ${DRIVE}$P"
        sudo umount -f ${DRIVE}$P
fi

# Refresh this variable as the device may not be mounted at script instantiation time
# This will always return one more then needed
NUM_OF_PARTS=`cat /proc/partitions | grep -v $ROOTDRIVE | grep -c $DEVICEDRIVENAME`
for ((c=1; c<"$NUM_OF_PARTS"; c++ ))
do
        SIZE=`cat /proc/partitions | grep -v $ROOTDRIVE | grep ‘\<‘$DEVICEDRIVENAME$P$c‘\>‘  | awk ‘{print $3}‘`
        echo "Current size of $DEVICEDRIVENAME$P$c $SIZE bytes"
done

#Section for partitioning the drive
#create 1 partition

cat << EOM

################################################################################

		Now erasing partition table

################################################################################

EOM
dd if=/dev/zero of=$DRIVE bs=1024 count=1024


cat << EOM

################################################################################

		Partitioning Boot

################################################################################
EOM
	mkfs.vfat -I -F 32 -n "boot" ${DRIVE}${P}

#Add directories for images
export START_DIR=$PWD
export PATH_TO_SDBOOT=boot

echo " "
echo "Mount the partitions "
mkdir $PATH_TO_SDBOOT

sudo mount -t vfat ${DRIVE}${P} boot/

echo " "
echo "Emptying partitions "
echo " "
sudo rm -rf  $PATH_TO_SDBOOT/*

echo ""
echo "Syncing...."
echo ""
sync
sync
sync

cat << EOM
################################################################################

	Copying files now... will take minutes

################################################################################

Copying boot partition
EOM

echo ""
#copy boot files out of board support
if [ -f "$1/MLO" ] ; then
   cp -f $1/* $PATH_TO_SDBOOT/
elif [ -f "$1/tiboot3.bin" ] ; then
   cp -f $1/* $PATH_TO_SDBOOT/
else
cat << EOM
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
ERROR: SD card file directory does not exist 
ERROR: ($1)
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
EOM
fi

echo ""
echo ""
echo "Syncing..."
sync
sync
sync

echo " "
echo "Un-mount the partitions "
sudo umount -f $PATH_TO_SDBOOT


echo " "
echo "Remove created temp directories "
sudo rm -rf $PATH_TO_SDBOOT


echo " "
echo "Operation Finished"
echo " "

AM335X-启动SD卡制作

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