AM335x USB Boot详细说明

最新推荐文章于 2024-09-18 17:48:12 发布

原创最新推荐文章于 2024-09-18 17:48:12 发布 · 551 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#AM3352 #TI #USB BOOT #uniflash

首先，要rev2.1的芯片才支持，以前的cpu有bug，无法使用usb boot

上位机需要uniflash，

以太网上截取的报文，可以进入第一阶段

AM335x自动从c:\am335x_flashtool\images目录下下载u-boot-spl-restore.bin

http://processors.wiki.ti.com/index.php/Sitara_Linux_AM335x_Flash_Programming_Linux_Development

注意，需要先关掉windows防火墙，才能tftp下载成功。

必须要用ubuntu才能编译，uboot下的config，需要用am335x_evm_XXXXXX, 在board.cfg 里能看到支持的平台，

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=flash-restore am335x_evm_ usbspl

然后执行拷贝，到uniflash的tftp主目录，改成固定文件名，就能看到打印信息。串口0上

COPY Z:\media\disk2\ti-sdk-am335x-evm-07.00.00.00\board-support\u-boot-2013.10-ti2013.12.01\flash-restore\u-boot.img C:\AM335x_Flashtool\images\u-boot-restore.img

COPY Z:\media\disk2\ti-sdk-am335x-evm-07.00.00.00\board-support\u-boot-2013.10-ti2013.12.01\flash-restore\spl\u-boot-spl.bin C:\AM335x_Flashtool\images\u-boot-spl-restore.bin

串口上的输出结果

U-Boot SPL 2013.10-00189-g78d8ebd-dirty (Jun 23 2014 - 13:00:54)

Could not read the EEPROM; something fundamentally wrong on the I2C bus.

Could not get board ID.

Could not read the EEPROM; something fundamentally wrong on the I2C bus.

Could not get board ID.

Unknown board, cannot configure pinmux.### ERROR ### Please RESET the board ###

看来我的理解没有错，SPL被通过usb Ethernet的tftp下载到内部sram上执行，执行后usb口再次被枚举成USB RNDIS以太网，下载uboot，然后再用uboot根据脚本Debrick Script下载内核文件系统等。整体的流程就是这样无疑。

U-Boot SPL 2013.10-00189-g78d8ebd-dirty (Jun 24 2014 - 13:00:20)

Using default environment

usb_ether

using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in

MAC d0:ff:50:03:cc:14

HOST MAC de:ad:be:af:00:00

RNDIS ready

musb-hdrc: peripheral reset irq lost!

high speed config #2: 2 mA, Ethernet Gadget, using RNDIS

USB RNDIS network up!

BOOTP broadcast 1

BOOTP broadcast 2

BOOTP broadcast 3

Using usb_ether device

TFTP from server 192.168.2.1; our IP address is 192.168.2.2

Filename 'u-boot-restore.img'.

Load address: 0x807fffc0

Loading: ###########################

752 KiB/s

done

Bytes transferred = 388968 (5ef68 hex)

U-Boot 2013.10-00189-g78d8ebd-dirty (Jun 24 2014 - 13:00:20)

I2C: ready

DRAM: 128 MiB

NAND: 128 MiB

MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1

Net: cpsw, usb_ether

Hit any key to stop autoboot: 0

mmc0 is current device

Scanning mmc 0...

** File not found /boot/zImage **

mmc0 is current device

SD/MMC found on device 0

reading uEnv.txt

** Unable to read file uEnv.txt **

** File not found /boot/zImage **

Card did not respond to voltage select!

mmc1(part 0) is current device

Card did not respond to voltage select!

Booting from nand ...

NAND read: device 0 offset 0x80000, size 0x40000

262144 bytes read: OK

NAND read: device 0 offset 0x200000, size 0x800000

8388608 bytes read: OK

Bad Linux ARM zImage magic!

U-Boot# setenv ethact usb_ether

U-Boot# tftp 0x80008000 zImage

using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in

MAC d0:ff:50:03:cc:16

HOST MAC de:ad:be:af:00:00

RNDIS ready

musb-hdrc: peripheral reset irq lost!

high speed config #2: 2 mA, Ethernet Gadget, using RNDIS

USB RNDIS network up!

Using usb_ether device

TFTP from server 192.168.100.111; our IP address is 192.168.100.241

Filename 'zImage'.

Load address: 0x80008000

Loading: T T

Abort

U-Boot# setenv ipaddr 192.168.2.2

U-Boot# setenv serverip 192.168.2.1

U-Boot# saveenv

Saving Environment to NAND...

Erasing NAND...

Erasing at 0x1c0000 -- 100% complete.

Writing to NAND... OK

U-Boot# tftp 0x80000000 zImage

using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in

MAC d0:ff:50:03:cc:16

HOST MAC de:ad:be:af:00:00

RNDIS ready

high speed config #2: 2 mA, Ethernet Gadget, using RNDIS

USB RNDIS network up!

Using usb_ether device

TFTP from server 192.168.2.1; our IP address is 192.168.2.2

Filename 'zImage'.

Load address: 0x80000000

Loading: T #################################################################

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

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

2 MiB/s

done

Bytes transferred = 32768000 (1f40000 hex)

U-Boot#

至此，usbboot已经完成功能，能通过usb下载boot和内核了，文件系统等均可以用usb eth通过tftp下载。