正在研究運(yùn)行Linux內(nèi)核4.19的Rcar Gen 3入門(mén)套件的早期開(kāi)發(fā)。 我想在安裝主rootfs之前加載初始ramdisk。

下面是我的配置。

內(nèi)核命令行：

load_dtb=ext4load mmc 0:1 0x48000000 /boot/r8a7796-m3ulcb.dtb

load_initramfs=ext4load mmc 0:1 0x5C3F9520 /boot/initramfs-netboot-image-m3ulcb.ext4.gz

load_ker=ext4load mmc 0:1 0x48080000 /boot/Image

bootargs=console=ttySC0,115200 vmalloc=384M video=HDMI-A-1:1920x1080-32@60 /dev/ram0 ramdisk_size=16384 rw rootfstype=ext4 rootwait quiet

bootcmd=run load_ker; run load_dtb; run load_initramfs; booti 0x48080000 0x5C3F9520:3A6AB6 0x48000000

(基于README.renesas-gen3文檔的修改)

引導(dǎo)日志(未完成)

...

[ 2.546095] RAMDISK: gzip image found at block 0

[ 2.551787] RAMDISK: gzip decompressor not configured!

[ 2.557952] Invalid ramdisk decompression routine. Select appropriate config option.

[ 2.565817] Kernel panic - not syncing: Could not decompress initial ramdisk image.

[ 2.573470] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G B 4.14.35-yocto-standard #11

[ 2.582073] Hardware name: Renesas M3ULCB board based on r8a7796 (DT)

[ 2.588506] Call trace:

[ 2.590958] [] dump_backtrace+0x0/0x3c8

[ 2.596352] [] show_stack+0x14/0x20

[ 2.601400] [] dump_stack+0x9c/0xbc

[ 2.606450] [] panic+0x11c/0x28c

[ 2.611236] [] rd_load_image+0x2e0/0x5d0

[ 2.616713] [] initrd_load+0x50/0x2c8

[ 2.621933] [] prepare_namespace+0xd8/0x1b8

[ 2.627674] [] kernel_init_freeable+0x208/0x22c

[ 2.633762] [] kernel_init+0x10/0x100

[ 2.638980] [] ret_from_fork+0x10/0x18

[ 2.644290] SMP: stopping secondary CPUs

[ 2.648208] Kernel Offset: disabled

[ 2.651691] CPU features: 0x1802000

[ 2.655173] Memory Limit: none

[ 2.658226] ---[ end Kernel panic - not syncing: Could not decompress initial ramdisk image.

[ 2.892822] mmc1: new ultra high speed SDR104 SDHC card at address aaaa

[ 2.907083] mmcblk1: mmc1:aaaa SB16G 14.8 GiB

[ 2.915770] mmcblk1: p1

[ 98.363653] random: crng init done

... kernel hung-up.

該錯(cuò)誤是由于缺少用于gzip的解壓縮工具所致。

實(shí)際上，我已經(jīng)通過(guò)內(nèi)核menuconfig禁用了所有其他壓縮方法

#

# Kernel compression mode

#

CONFIG_HAVE_KERNEL_LZO=y

CONFIG_KERNEL_LZO=y

CONFIG_LZO_COMPRESS=y

CONFIG_LZO_DECOMPRESS=y

CONFIG_DECOMPRESS_GZIP=n

CONFIG_DECOMPRESS_BZIP2=n

CONFIG_DECOMPRESS_LZMA=n

CONFIG_DECOMPRESS_XZ=n

CONFIG_DECOMPRESS_LZO=y

CONFIG_DECOMPRESS_LZ4=n

CONFIG_RD_GZIP=n

CONFIG_RD_BZIP2=n

CONFIG_RD_LZMA=n

CONFIG_RD_XZ=n

CONFIG_RD_LZO=y

CONFIG_RD_LZ4=n

但是我不知道ramdisk仍然是Gzip。 我只想保留LZO格式以加快解壓縮速度。 因此，如何配置以LZO壓縮模式構(gòu)建initRAMFS？

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