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link管理  ›  Starting and running system completely in RAM (from UBOOT) - Linux and Applications - F&S Support F
kernel
https://forum.fs-net.de/index.php?thread/4678-starting-and-running-system-completely-in-ram-from-uboot/
低调的炒面
6 月前

To run a system without any ROM completely in RAM, on a efusa9x module, I tried the following steps, but failed to load the ROOTFS in the RAM from the LINUX kernel.

Following the steps here to configured a minimal system and started it from RAM:

https://imxdev.gitlab.io/tutor…o_boot_imx_using_ramdisk/

The used buildroot configuration for the filesystem is the following:

  • [ ] axfs root filesystem │ │
  • │ │ [ ] btrfs root filesystem │ │
  • │ │ [ ] cloop root filesystem for the target device │ │
  • │ │ [ ] cpio the root filesystem (for use as an initial RAM filesystem) │ │
  • │ │ [ ] cramfs root filesystem │ │
  • │ │ [*] ext2/3/4 root filesystem │ │
  • │ │ ext2/3/4 variant (ext2 (rev1)) ---> │ │
  • │ │ () filesystem label │ │
  • │ │ (40M) exact size │ │
  • │ │ (0) exact number of inodes (leave at 0 for auto calculation) │ │
  • │ │ (5) reserved blocks percentage │ │
  • │ │ (-O ^64bit) additional mke2fs options │ │
  • │ │ Compression method (gzip) ---> │ │
  • │ │ [ ] f2fs root filesystem │ │
  • │ │ [ ] initial RAM filesystem linked into linux kernel │ │
  • │ │ [ ] jffs2 root filesystem │ │
  • │ │ [ ] romfs root filesystem │ │
  • │ │ [ ] squashfs root filesystem │ │
  • │ │ [ ] tar the root filesystem │ │
  • │ │ [ ] ubi image containing an ubifs root filesystem │ │
  • │ │ [ ] ubifs root filesystem │ │
  • │ │ [ ] yaffs2 root filesystem
  • setenv initrd_size ${filesize}
  • setenv bootargs 'console=ttymxc0,115200 login_tty=ttymxc0,115200 root=/dev/ram rw'
  • bootz 81000000 83000000 82000000
  • caam_jr 2101000.jr0: registering rng-caam
  • caam-snvs 20cc000.caam-snvs: can't get snvs clock
  • caam-snvs 20cc000.caam-snvs: violation handlers armed - non-secure state
  • NET: Registered protocol family 26
  • NET: Registered protocol family 17
  • can: controller area network core (rev 20120528 abi 9)
  • NET: Registered protocol family 29
  • can: raw protocol (rev 20120528)
  • can: broadcast manager protocol (rev 20161123 t)
  • can: netlink gateway (rev 20130117) max_hops=1
  • 8021q: 802.1Q VLAN Support v1.8
  • Key type dns_resolver registered
  • cpu cpu0: Registered imx6q-cpufreq
  • imx_thermal 2000000.aips-bus:tempmon: Extended Commercial CPU temperature grade - max:105C critical:100CC
  • rtc-pcf8563 0-0051: low voltage detected, date/time is not reliable.
  • rtc-pcf8563 0-0051: retrieved date/time is not valid.
  • rtc-pcf8563 0-0051: hctosys: unable to read the hardware clock
  • List of all partitions:
  • 0100 8192 ram0 (driver?)
  • 0101 8192 ram1 (driver?)
  • 0102 8192 ram2 (driver?)
  • 0103 8192 ram3 (driver?)
  • 0104 8192 ram4 (driver?)
  • 0105 8192 ram5 (driver?)
  • 0106 8192 ram6 (driver?)
  • 0107 8192 ram7 (driver?)
  • 1f00 262144 mtdblock0 (driver?)
  • No filesystem could mount root, tried: ext2
  • Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)

    • P.s.:

    Additional I tried to define the ROOTFS by its address and size like mentioned here:

    https://lists.denx.de/pipermail/u-boot/2009-June/054782.html

  • #setenv initrd_size ${filesize}
  • #setenv bootargs 'console=ttymxc0,115200 login_tty=ttymxc0,115200 root=/dev/ram rw'
  • setenv bootargs "console=ttymxc0,115200 login_tty=ttymxc0,115200 root=/dev/ram0 rd_start=83000000 rd_size=${filesize} rootfstype=ext2 rw"
  • bootz 81000000 83000000 82000000

    • Have you enabled the entry "General setup" -> "Initial RAM filesystem and RAM disk (initramfs/initrd) support" in the Linux kernel? For example by calling make linux-menuconfig in Buildroot. It looks like it is not enabled in our default fsimx6sx_defconfig.

    Your F&S Support Team

    Indeed, I checked the kernel configuration but missed that option. But now it works and we can perform test independent from NAND.

    Case closed.

    Thanks.

  • [*] cpio the root filesystem (for use as an initial RAM filesystem)
  • Compression method (gzip)
  • [*] Create U-Boot image of the root filesystem
  • # config kernel
  • make linux-menuconfig
  • General setup
  • [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support
  • [*] Support initial ramdisks compressed using gzip
  • tftpboot 83000000 rootfs.cpio.uboot
  • setenv bootargs "console=ttymxc0,115200 login_tty=ttymxc0,115200 root=/dev/ram0 ramdisk_size=0x${filesize} rootfstype=cpio rw"
  • bootz 81000000 83000000 82000000
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