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--- do_gentoo_on_usd_for_iot-gate-imx7 [2017/11/04 23:47]
admin
+++ do_gentoo_on_usd_for_iot-gate-imx7 [2017/11/21 17:44]
admin
@@ Line 1: / Line 1: @@
+== Parted ==
+  parted /dev/sdX
+  mklabel msdos
+  mkpart primary fat32 2048s 150M
+  mkpart primary ext4 150M -1
 == Understand the firmware ==
 When I open the folder **install/** into **cl-som-imx7-linux.zip**, I scan with ''file'' command to understand what I have, usually ARM hardware use uboot, then I hope uboot system + linux kernel + ramdisk.
+I wish //gentoo// to have better 0-days hardened, but have to uSD card allow me debug the OS offline, save the data in all case.
   * boot.scr:                   u-boot legacy uImage, , Linux/ARM, Script File (Not compressed), 1086 bytes, Mon Aug 21 06:43:51 2017, Load Address: 0x00000000, Entry Point: 0x00000000, Header CRC: 0xF57D03AB, Data CRC: 0x289863A9
   * imx7d-cl-som-imx7-m4.dtb:   Device Tree Blob version 17, size=38386, boot CPU=0, string block size=2350, DT structure block size=35980
@@ Line 17: / Line 26: @@
   * rootfs.tar.bz2:             bzip2 compressed data, block size = 900k
   * zImage:                     Linux kernel ARM boot executable zImage (little-endian)
+Into the boot scr decompiled I see:
+  setenv bootargs "root=/dev/ram0 rw ramdisk_size=16384 console=$tty vram=16M auto_install ${board_param}"
+  setenv ramimg ramdisk.img
+  load ${storagetype} ${storagedev} ${fdtaddr} ${fdtfile}
+  load ${storagetype} ${storagedev} ${loadaddr} ${kernel}
+  load ${storagetype} ${storagedev} ${rdaddr} ${ramimg}
+Then it will be easy the boot the current kernel to uSD part to boot gentoo.
+I do:
+  dd bs=1 skip=72 if=boot.scr of=boot.script
+I change into:
+  #System for CL-SOM-iMX7
+  # Parameters
+  setenv tty "ttymxc0,115200"
+  setenv mmcdev 0
+  setenv rdaddr 0x82000000
+  setenv loadaddr 0x80800000
+  setenv fdtaddr 0x83000000
+  setenv fdt_high 0xffffffff
+  setenv initrd_high 0xffffffff
+  test -z "$fdtfile" && setenv fdtfile $fdt_file
+  setenv bootargs "root=/dev/mmcblk0p2 ro console=$tty vram=16M"
+  setenv kernel kernel.img
+  test -z "$storagetype" && setenv storagetype mmc
+  test -z "$storagedev" && setenv storagedev ${mmcdev}
+  # Script start
+  load ${storagetype} ${storagedev} ${fdtaddr} ${fdtfile}
+  load ${storagetype} ${storagedev} ${loadaddr} ${kernel}
+  echo "Starting uSD system ..."
+  bootz ${loadaddr} ${fdtaddr}
+After install the package **dev-embedded/u-boot-tools** I do:
+  mkimage -C none -A arm -T script -d boot.script boot.scr
+After I do my ext4 part with rootfs.tar.bz2 content into my second uSD partition. Or other system keeping the **/lib/modules/** at the first time util I do my own kernel. FAT32 on first part with:
+  * boot.scr
+  * kernel.img
+  * imx7d-sbc-iot-imx7.dtb

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