Beaglebone Black：无法显示 u-boot 提示
Beaglebone Black : Could not display u-boot prompt
我正在学习 Mastering Embedded Linux Programming second edition
看不到 u-boot 提示符 (U-Boot#)
我用的是u-boot v2020.07, crosstool-ng v1.24.0 复制了MLO, u-boot.img到sd卡
我该如何解决这个问题？
谢谢。
U-Boot SPL 2020.07 (Oct 21 2020 - 13:46:52 +0900)
Trying to boot from MMC1
U-Boot 2020.07 (Oct 21 2020 - 13:46:52 +0900)
CPU : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM: 512 MiB
WDT: Started with servicing (60s timeout)
NAND: 0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from FAT... *** Warning - bad CRC, using default environment
<ethaddr> not set. Validating first E-fuse MAC
Net: eth0: ethernet@4a100000
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
, eth1: usb_ether
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc1(part 0) is current device
Scanning mmc 1:1...
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
Error: "bootcmd_nand0" not defined
starting USB...
Bus usb@47401800: Port not available.
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
missing environment variable: pxeuuid
Retrieving file: pxelinux.cfg/01-d0-5f-b8-d1-0b-67
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/00000000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/0000000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/000000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/00000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/0000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/00
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/0
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default-arm-am33xx-am335x
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default-arm-am33xx
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default-arm
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Config file not found
starting USB...
Bus usb@47401800: Port not available.
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
=>
这可能是您得到的提示是您所期望的提示，但您确实从 u-boot 得到了提示，即您发布的输出中的最后一个 =>。
如果您输入 help 然后按回车键，您应该会得到可用命令的列表。
这本书现在已经五年了，而您使用的是 u-boot 2020.07，这可以解释差异。
作者可能在他编译的u-boot中自定义了提示信息：你可以通过在CONFIG_SYS_PROMPT符号定义中添加一个adding/modifying值来实现同样的效果您使用的配置文件，例如 configs/am335x_evm_defconfig
CONFIG_SYS_PROMPT="U-Boot# "
在 re-compiled u-boot 之后，您应该会得到您所期望的准确提示信息。
我正在学习 Mastering Embedded Linux Programming second edition
看不到 u-boot 提示符 (U-Boot#)
我用的是u-boot v2020.07, crosstool-ng v1.24.0 复制了MLO, u-boot.img到sd卡
我该如何解决这个问题？
谢谢。
U-Boot SPL 2020.07 (Oct 21 2020 - 13:46:52 +0900)
Trying to boot from MMC1
U-Boot 2020.07 (Oct 21 2020 - 13:46:52 +0900)
CPU : AM335X-GP rev 2.1
Model: TI AM335x BeagleBone Black
DRAM: 512 MiB
WDT: Started with servicing (60s timeout)
NAND: 0 MiB
MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
Loading Environment from FAT... *** Warning - bad CRC, using default environment
<ethaddr> not set. Validating first E-fuse MAC
Net: eth0: ethernet@4a100000
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
, eth1: usb_ether
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
switch to partitions #0, OK
mmc0 is current device
SD/MMC found on device 0
switch to partitions #0, OK
mmc1(part 0) is current device
Scanning mmc 1:1...
switch to partitions #0, OK
mmc1(part 0) is current device
SD/MMC found on device 1
Error: "bootcmd_nand0" not defined
starting USB...
Bus usb@47401800: Port not available.
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
missing environment variable: pxeuuid
Retrieving file: pxelinux.cfg/01-d0-5f-b8-d1-0b-67
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/00000000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/0000000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/000000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/00000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/0000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/000
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/00
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/0
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default-arm-am33xx-am335x
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default-arm-am33xx
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default-arm
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Retrieving file: pxelinux.cfg/default
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
Config file not found
starting USB...
Bus usb@47401800: Port not available.
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
ethernet@4a100000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Warning: usb_ether MAC addresses don't match:
Address in ROM is de:ad:be:ef:00:01
Address in environment is d0:5f:b8:d1:0b:69
using musb-hdrc, OUT ep1out IN ep1in STATUS ep2in
MAC de:ad:be:ef:00:01
HOST MAC de:ad:be:ef:00:00
RNDIS ready
=>
这可能是您得到的提示是您所期望的提示，但您确实从 u-boot 得到了提示，即您发布的输出中的最后一个 =>。
如果您输入 help 然后按回车键，您应该会得到可用命令的列表。
这本书现在已经五年了，而您使用的是 u-boot 2020.07，这可以解释差异。
作者可能在他编译的u-boot中自定义了提示信息：你可以通过在CONFIG_SYS_PROMPT符号定义中添加一个adding/modifying值来实现同样的效果您使用的配置文件，例如 configs/am335x_evm_defconfig
CONFIG_SYS_PROMPT="U-Boot# "
在 re-compiled u-boot 之后，您应该会得到您所期望的准确提示信息。