Hi,
I wrote a simple demo app for sending short message every second over UART B from Cortex M4 core. I’m using Keil MDK 5 and ULink Pro debugger. Everything works great if I stop Linux from booting and enter debug session from Keil uVision.
Now I’m trying to start M4 app from U-boot, but nothing happens:
Colibri iMX7 # tftp m4.elf
Using FEC0 device
TFTP from server 192.168.1.22; our IP address is 192.168.1.253
Filename 'm4.elf'.
Load address: 0x80800000
Loading: ################################################## 31.4 KiB
3.1 MiB/s
done
Bytes transferred = 32144 (7d90 hex)
Colibri iMX7 # dcache flush
Colibri iMX7 # bootaux ${loadaddr}
## Starting auxiliary core at 0x1FFF8241 ...
U-boot is still alive, but UART_B is not transmitting data. If i repeat the process without rebooting board, I get the message “Auxiliary core is already up”.
I made some changes to uboot enviroment variables:
arch=arm
baudrate=115200
board=colibri_imx7
board_name=colibri_imx7
boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}extlinux/extlinux.conf
boot_file=zImage
boot_net_usb_start=usb start
boot_prefixes=/ /boot/
boot_script_dhcp=boot.scr.uimg
boot_scripts=boot.scr.uimg boot.scr
boot_targets=mmc0 mmc1 usb0 dhcp
bootcmd=setenv fdtfile ${soc}-colibri-emmc-${fdt_board}.dtb && run distro_bootcmd;
bootcmd_dhcp=if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;
bootcmd_mmc0=setenv devnum 0; run mmc_boot
bootcmd_mmc1=setenv devnum 1; run mmc_boot
bootcmd_usb0=setenv devnum 0; run usb_boot
bootdelay=15
bootm_size=0x10000000
console=ttymxc0
cpu=armv7
defargs=clk_ignore_unused
distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done
emmcargs=ip=off root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait
emmcboot=run setup; setenv bootargs ${defargs} ${emmcargs} ${setupargs} ${vidargs}; echo Booting from internal eMMC chip...; run m4boot && load mmc 0:1 ${fdt_addr_r} ${soc}-colibri-emmc-${fdt_board}.dtb && load mmc 0:1 ${kernel_addr_r} ${boot_file} && run fdt_fixup && bootz ${kernel_addr_r} - ${fdt_addr_r}
eth1addr=00:14:2d:71:3b:40
ethact=FEC0
ethaddr=00:14:2d:61:3b:40
ethprime=FEC
fdt_addr_r=0x82000000
fdt_board=eval-v3
fdt_fixup=fdt addr ${fdt_addr_r} && fdt rm /soc/aips-bus@30800000/spba-bus@30800000/serial@30890000
fdtcontroladdr=bff94490
initrd_high=0xffffffff
ip_dyn=yes
ipaddr=192.168.1.253
kernel_addr_r=0x81000000
kernel_file=zImage
loadaddr=0x80800000
m4boot=;
mmc_boot=if mmc dev ${devnum}; then setenv devtype mmc; run scan_dev_for_boot_part; fi
netmask=255.255.255.0
nfsargs=ip=:::::eth0: root=/dev/nfs
nfsboot=run setup; setenv bootargs ${defargs} ${nfsargs} ${setupargs} ${vidargs}; echo Booting from NFS...;dhcp ${kernel_addr_r} && tftp ${fdt_addr_r} ${soc}-colibri-emmc-${fdt_board}.dtb && run fdt_fixup && bootz ${kernel_addr_r} - ${fdt_addr_r}
pxefile_addr_r=0x87100000
ramdisk_addr_r=0x82100000
scan_dev_for_boot=echo Scanning ${devtype} ${devnum}:${distro_bootpart}...; for prefix in ${boot_prefixes}; do run scan_dev_for_extlinux; run scan_dev_for_scripts; done;
scan_dev_for_boot_part=part list ${devtype} ${devnum} -bootable devplist; env exists devplist || setenv devplist 1; for distro_bootpart in ${devplist}; do if fstype ${devtype} ${devnum}:${distro_bootpart} bootfstype; then run scan_dev_for_boot; fi; done
scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}extlinux/extlinux.conf; then echo Found ${prefix}extlinux/extlinux.conf; run boot_extlinux; echo SCRIPT FAILED: continuing...; fi
scan_dev_for_scripts=for script in ${boot_scripts}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${script}; then echo Found U-Boot script ${prefix}${script}; run boot_a_script; echo SCRIPT FAILED: continuing...; fi; done
scriptaddr=0x87000000
sdargs=root=/dev/mmcblk1p2 ro rootwait
sdboot=run setup; setenv bootargs ${defargs} ${sdargs} ${setupargs} ${vidargs}; echo Booting from MMC/SD card...; run m4boot && load mmc 1:1 ${kernel_addr_r} ${kernel_file} && load mmc 1:1 ${fdt_addr_r} ${soc}-colibri-emmc-${fdt_board}.dtb && run fdt_fixup && bootz ${kernel_addr_r} - ${fdt_addr_r}
serial#=06372160
serverip=192.168.1.22
setethupdate=if env exists ethaddr; then; else setenv ethaddr 00:14:2d:00:00:00; fi; tftpboot ${loadaddr} ${board}/flash_eth.img && source ${loadaddr}
setsdupdate=mmc rescan && setenv interface mmc && fatload ${interface} 1:1 ${loadaddr} ${board}/flash_blk.img && source ${loadaddr}
setup=setenv setupargs console=tty1 console=${console},${baudrate}n8 ${memargs} consoleblank=0
setupdate=run setsdupdate || run setusbupdate || run setethupdate
setusbupdate=usb start && setenv interface usb && fatload ${interface} 0:1 ${loadaddr} ${board}/flash_blk.img && source ${loadaddr}
soc=imx7d
splashpos=m,m
updlevel=2
usb_boot=usb start; if usb dev ${devnum}; then setenv devtype usb; run scan_dev_for_boot_part; fi
variant=-emmc
vendor=toradex
vidargs=video=mxsfb:640x480M-16@60
videomode=video=ctfb:x:640,y:480,depth:18,pclk:39722,le:48,ri:16,up:33,lo:10,hs:96,vs:2,sync:0,vmode:0
Environment size: 4400/8188 bytes
I made elf file from axf file with following command:
fromelf --elf --nodebug --output=M4.elf M4.axf
; *************************************************************
; *** Scatter-Loading Description File generated by uVision ***
; *************************************************************
LR_IROM1 0x1FFF8000 0x00008000 { ; load region size_region
ER_IROM1 0x1FFF8000 0x00008000 { ; load address = execution address
*.o (RESET, +First)
*(InRoot$$Sections)
.ANY (+RO)
.ANY (+XO)
}
RW_IRAM1 0x20000000 0x00008000 { ; RW data
.ANY (+RW +ZI)
}
}