Hi,
I'm trying to follow a training on Linux embedded (https://bootlin.com/doc/training/embedded-linux-qemu/).
I generated the crosstool chain for an ARM target, then I compiled U-boot and a Linux Kernel.
Uboot starts, I can send it the kernel, and the dtb file of the emulated target, by a tftp server.
(the command to start my QEMU :
sudo qemu-system-arm -M vexpress-a9 -m 128M -nographic -kernel u-boot -sd sd.img -nic user,hostfwd=tcp::5022-:22,tftp=.)
I edited the bootargs and bootcmd variables in order to load automaticaly the kernel image and dtb file. It seems it works.
The network is configured by dhcp protocol (and u-boot command so).
The ip address of my target is 10.0.2.15. And the server adress (it's a WSL system with Debian) is 10.0.2.2.
Not sure where dhcp command of u-boot got this address.
The real adress of the WSL system is 172.23.78.41 (I made a command, I don't remember which one, to have also the adress 10.0.2.2)
During this training, I have to create a rootfs for my Linux Kernel. The training want we use a NFS server to handle the rootfs.
The NFS is server is configured so (in /etc/exports):
(As you can see, i made some tries, before coming ...)
But, I'm not able to reach NSF server from U-boot, I have this error VFS: Unable to mount root fs via NFS.
The current values of bootargs and bootcmd :
bootargs=console=ttyAMA0,115200 root=/dev/nfs ip=10.0.2.15::::::eth0 nfsroot=10.0.2.2:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot,nfsvers=3,tcp rw
bootcmd=run distro_bootcmd; tftp 0x61000000 zImage;tftp 0x62000000 vexpress-v2p-ca9.dtb; bootz 0x61000000 - 0x62000000
Not sure if useful, but here the complete printenv values:
I see 1 error during copy/past variables :
nfsroot=172.23.78.41:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot which should be nfsroot=10.0.2.2:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot
I corrected it now ... same issue :-(
Can you help to have a functionnal NFS server ( WSL Debian tells me servir is ok , see attached file)
By advance, thank you for your answers :-)
More infos:
Im able ton ping "server" from U-boot, with "ping 10.0.2.2".
But no response from target, when I do "ping 10.0.2.15".
When I used a static IP, with 172.23.78.41 for server and 172.23.78.42 for client ( The emulated target by QEmu), I was able to ping from both direction.
I made :
But to be honest, I thought the static adress were erased by the macro "run distro_boot" in bootcmd variables, which launch dhcp command.
With the value bootcmd=tftp 0x61000000 zImage;tftp 0x62000000 vexpress-v2p-ca9.dtb; bootz 0x61000000 - 0x62000000, the TFTP server wasn't reachable.
I'm trying to follow a training on Linux embedded (https://bootlin.com/doc/training/embedded-linux-qemu/).
I generated the crosstool chain for an ARM target, then I compiled U-boot and a Linux Kernel.
Uboot starts, I can send it the kernel, and the dtb file of the emulated target, by a tftp server.
(the command to start my QEMU :
sudo qemu-system-arm -M vexpress-a9 -m 128M -nographic -kernel u-boot -sd sd.img -nic user,hostfwd=tcp::5022-:22,tftp=.)
I edited the bootargs and bootcmd variables in order to load automaticaly the kernel image and dtb file. It seems it works.
The network is configured by dhcp protocol (and u-boot command so).
The ip address of my target is 10.0.2.15. And the server adress (it's a WSL system with Debian) is 10.0.2.2.
Not sure where dhcp command of u-boot got this address.
The real adress of the WSL system is 172.23.78.41 (I made a command, I don't remember which one, to have also the adress 10.0.2.2)
During this training, I have to create a rootfs for my Linux Kernel. The training want we use a NFS server to handle the rootfs.
The NFS is server is configured so (in /etc/exports):
# /etc/exports: the access control list for filesystems which may be exported # to NFS clients. See exports(5). # # Example for NFSv2 and NFSv3: # /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check) # # Example for NFSv4: # /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check) # /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check) # #/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot 172.23.78.42(rw,no_root_squash,no_subtree_check) #/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot 127.0.0.1(rw,no_root_squash,no_subtree_check,insecure) #/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot *(rw,sync,no_subtree_check) /home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot 10.0.2.15(rw,sync,no_subtree_check)
(As you can see, i made some tries, before coming ...)
But, I'm not able to reach NSF server from U-boot, I have this error VFS: Unable to mount root fs via NFS.
The current values of bootargs and bootcmd :
bootargs=console=ttyAMA0,115200 root=/dev/nfs ip=10.0.2.15::::::eth0 nfsroot=10.0.2.2:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot,nfsvers=3,tcp rw
bootcmd=run distro_bootcmd; tftp 0x61000000 zImage;tftp 0x62000000 vexpress-v2p-ca9.dtb; bootz 0x61000000 - 0x62000000
Not sure if useful, but here the complete printenv values:
arch=arm
baudrate=38400
board=vexpress
board_name=vexpress
boot_a_script=load ${devtype} ${devnum}:${distro_bootpart} ${scriptaddr} ${prefix}${script}; source ${scriptaddr}
boot_efi_binary=load ${devtype} ${devnum}:${distro_bootpart} ${kernel_addr_r} efi/boot/bootarm.efi; if fdt addr -q ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r};else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi
boot_efi_bootmgr=if fdt addr -q ${fdt_addr_r}; then bootefi bootmgr ${fdt_addr_r};else bootefi bootmgr;fi
boot_extlinux=sysboot ${devtype} ${devnum}:${distro_bootpart} any ${scriptaddr} ${prefix}${boot_syslinux_conf}
boot_prefixes=/ /boot/
boot_script_dhcp=boot.scr.uimg
boot_scripts=boot.scr.uimg boot.scr
boot_syslinux_conf=extlinux/extlinux.conf
boot_targets=mmc1 mmc0 pxe dhcp
bootargs=console=ttyAMA0,115200 root=/dev/nfs ip=10.0.2.15::::::eth0 nfsroot=10.0.2.2:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot,nfsvers=3,tcp rw
bootargs_tmp=root=/dev/sda1 rw console=ttyAMA0,38400n8 mem=1024M mtdparts=armflash:1M@0x800000(uboot),7M@0x1000000(kernel),24M@0x2000000(initrd) mmci.fmax=190000 devtmpfs.mount=0 vmalloc=256M
bootcmd=run distro_bootcmd; tftp 0x61000000 zImage;tftp 0x62000000 vexpress-v2p-ca9.dtb; bootz 0x61000000 - 0x62000000
bootcmd_dhcp=devtype=dhcp; if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi; setenv efi_old_vci ${bootp_vci};setenv efi_old_arch ${bootp_arch};setenv bootp_vci PXEClient:Arch:00010:UNDI:003000;setenv bootp_arch 0xa;if dhcp ${kernel_addr_r}; then tftpboot ${fdt_addr_r} dtb/${efi_fdtfile};if fdt addr -q ${fdt_addr_r}; then bootefi ${kernel_addr_r} ${fdt_addr_r}; else bootefi ${kernel_addr_r} ${fdtcontroladdr};fi;fi;setenv bootp_vci ${efi_old_vci};setenv bootp_arch ${efi_old_arch};setenv efi_fdtfile;setenv efi_old_arch;setenv efi_old_vci;
bootcmd_mmc0=devnum=0; run mmc_boot
bootcmd_mmc1=devnum=1; run mmc_boot
bootcmd_pxe=dhcp; if pxe get; then pxe boot; fi
bootdelay=2
bootfile=boot.scr.uimg
bootflash=run flashargs; cp ${ramdisk_addr} ${ramdisk_addr_r} ${maxramdisk}; bootm ${kernel_addr} ${ramdisk_addr_r}
bootfstype=fat
console=ttyAMA0,38400n8
cpu=armv7
disable_ipv6=1
distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done
distro_bootpart_uuid=af3731d1-01
dnsip=10.0.2.3
dram=1024M
efi_dtb_prefixes=/ /dtb/ /dtb/current/
env=bootcmd tftp 0x61000000 zImage
ethact=ethernet@3,02000000
ethaddr=52:54:00:12:34:56
fdt_addr_r=0x60000000
fdtcontroladdr=6087ff30
fdtfile=vexpress-v2p-ca9.dtb
fileaddr=62000000
filesize=3701
flashargs=setenv bootargs root=${root} console=${console} mem=${dram} mtdparts=${mtd} mmci.fmax=190000 devtmpfs.mount=0 vmalloc=256M
foo=bar
gatewayip=10.0.2.2
ipaddr=10.0.2.15
kernel_addr_r=0x60100000
load_efi_dtb=load ${devtype} ${devnum}:${distro_bootpart} ${fdt_addr_r} ${prefix}${efi_fdtfile}
loadaddr=0x60100000
mmc_boot=if mmc dev ${devnum}; then devtype=mmc; run scan_dev_for_boot_part; fi
mtd=armflash:1M@0x800000(uboot),7M@0x1000000(kernel),24M@0x2000000(initrd)
netmask=255.255.255.0
nfsroot=172.23.78.41:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot
root=/dev/sda1 rw
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;run scan_dev_for_efi;
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 part uuid ${devtype} ${devnum}:${distro_bootpart} distro_bootpart_uuid ; run scan_dev_for_boot; fi; done; setenv devplist
scan_dev_for_efi=setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${board}${boardver}.dtb; fi; for prefix in ${efi_dtb_prefixes}; do if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${efi_fdtfile}; then run load_efi_dtb; fi;done;run boot_efi_bootmgr;if test -e ${devtype} ${devnum}:${distro_bootpart} efi/boot/bootarm.efi; then echo Found EFI removable media binary efi/boot/bootarm.efi; run boot_efi_binary; echo EFI LOAD FAILED: continuing...; fi; setenv efi_fdtfile
scan_dev_for_extlinux=if test -e ${devtype} ${devnum}:${distro_bootpart} ${prefix}${boot_syslinux_conf}; then echo Found ${prefix}${boot_syslinux_conf}; run boot_extlinux; echo EXTLINUX 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
serverip=10.0.2.2
stderr=uart@9000
stdin=uart@9000
stdout=uart@9000
ubifs_boot=if ubi part ${bootubipart} ${bootubioff} && ubifsmount ubi0:${bootubivol}; then devtype=ubi; devnum=ubi0; bootfstype=ubifs; distro_bootpart=${bootubivol}; run scan_dev_for_boot; ubifsumount; fi
vendor=armltd
Environment size: 5048/262140 bytes
I see 1 error during copy/past variables :
nfsroot=172.23.78.41:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot which should be nfsroot=10.0.2.2:/home/alex/embedded-linux-qemu-labs/tinysystem/nfsroot
I corrected it now ... same issue :-(
Can you help to have a functionnal NFS server ( WSL Debian tells me servir is ok , see attached file)
By advance, thank you for your answers :-)
More infos:
Im able ton ping "server" from U-boot, with "ping 10.0.2.2".
But no response from target, when I do "ping 10.0.2.15".
When I used a static IP, with 172.23.78.41 for server and 172.23.78.42 for client ( The emulated target by QEmu), I was able to ping from both direction.
I made :
setenv ipdaddr 172.23.78.42 setenv serverip 172.23.78.41 saveenv
But to be honest, I thought the static adress were erased by the macro "run distro_boot" in bootcmd variables, which launch dhcp command.
With the value bootcmd=tftp 0x61000000 zImage;tftp 0x62000000 vexpress-v2p-ca9.dtb; bootz 0x61000000 - 0x62000000, the TFTP server wasn't reachable.