fdisk /dev/sdf Command (m for help): p Disk /dev/sdf: 14.86 GiB, 15931539456 bytes, 31116288 sectors Units: sectors of 1 * 512 = 512 bytes Device Boot Start End Sectors Size Id Type /dev/sdf1 8192 30805119 30796928 14.7G 83 LinuxSo, we have 8M of unpartitioned disk followed by a linux ext4 filesystem.
The /boot directory looks like the following. The dtb subdirectory contains a myriad of files that we may investiage later.
[root@trona boot]# ls -l total 44080 -rw-r--r-- 1 root root 165 Aug 5 17:17 armbianEnv.txt -rw-r--r-- 1 root root 1536 Jun 8 09:46 armbian_first_run.txt.template -rw-r--r-- 1 root root 230454 Jun 8 09:46 boot.bmp -rw-r--r-- 1 root root 2961 Jun 8 09:33 boot.cmd -rw-r--r-- 1 root root 4882 Jun 8 09:46 boot-desktop.png -rw-rw-r-- 1 root root 3033 Jun 8 09:47 boot.scr -rw-r--r-- 1 root root 186877 Jun 2 08:20 config-5.4.43-sunxi64 lrwxrwxrwx 1 root root 18 Jun 8 09:36 dtb -> dtb-5.4.43-sunxi64 drwxr-xr-x 3 root root 4096 Jun 8 09:36 dtb-5.4.43-sunxi64 lrwxrwxrwx 1 root root 22 Jun 8 09:36 Image -> vmlinuz-5.4.43-sunxi64 -rw-r--r-- 1 root root 11889114 Jun 8 09:49 initrd.img-5.4.43-sunxi64 -rw-r--r-- 1 root root 3739140 Jun 2 08:20 System.map-5.4.43-sunxi64 lrwxrwxrwx 1 root root 22 Jun 8 09:49 uInitrd -> uInitrd-5.4.43-sunxi64 -rw-r--r-- 1 root root 11889178 Jun 8 09:49 uInitrd-5.4.43-sunxi64 -rwxr-xr-x 1 root root 17162752 Jun 2 08:20 vmlinuz-5.4.43-sunxi64
Startup messages look like this:
Found U-Boot script /boot/boot.scr 3033 bytes read in 3 ms (987.3 KiB/s) ## Executing script at 4fc00000 U-boot loaded from SD Boot script loaded from mmc 165 bytes read in 3 ms (53.7 KiB/s) 29743 bytes read in 6 ms (4.7 MiB/s) 4191 bytes read in 6 ms (681.6 KiB/s) Applying kernel provided DT fixup script (sun50i-h5-fixup.scr) ## Executing script at 44000000 11889178 bytes read in 569 ms (19.9 MiB/s) 17162752 bytes read in 820 ms (20 MiB/s) ## Loading init Ramdisk from Legacy Image at 4fe00000 ... Image Name: uInitrd Image Type: AArch64 Linux RAMDisk Image (gzip compressed) Data Size: 11889114 Bytes = 11.3 MiB Load Address: 00000000 Entry Point: 00000000 Verifying Checksum ... OK ## Flattened Device Tree blob at 4fa00000 Booting using the fdt blob at 0x4fa00000 Loading Ramdisk to 494a9000, end 49fff9da ... OK Loading Device Tree to 0000000049439000, end 00000000494a8fff ... OK Starting kernel ... Armbian 20.05.2 Buster ttyS0A lot of interesting stuff is in arch/arm64/kernel. In particular head.S has early startup code including a branch to start_kernel()
Have any comments? Questions? Drop me a line!Tom's electronics pages / tom@mmto.org