Ankur Tank <artfri2@...> writes: > > > > Hello Experts, > We have BBB based custom Linux board running Linux 3.12 > We are using SysV init, for boot, And I understand that boot happens in following sequence, > > 1. ROM code lookks for boot device based on boot pin configuration. > 2. ROM code loads first stage boot loader(SPL/X-loader) to Internal SRAM and gives control to it. > 3. SPL does some initialization like DDR and proceeds to load U-Boot to RAM > 4. U-Boot does other peripheral initialization i.e. NAND/eMMC/ethernet and loads kernel+dtb > 5. Kernel executes initializes configures different hardware/peripherals based on dtb and initializes all the drivers. > 6. Kernel runs first process i.e. init (/sbin/init in our case but can be set in Kernel command line parameters). > 7. init application based on inittab(configuration file) runs startup script specified in inittab file e.g. ::sysinit:/etc/init.d/rcS > > 8. This /etc/init.d/rcS runs all the init scripts placed in "/etc/init.d/" folder. > > So this is how board boots with SysV init, (or atleast this is my understanding), Correct If I am wrong in some points, > Now some point we want to evaluate how "systemd" init happens, we will have to make POC and see any improvement or degradation of the system boot and process maintenance. > > We know some basics that systemd works on cgroups and can start processes in parallel but handles process like what monit does. > However what we don't know is "Boot process with systemd' can someone explain boot process with systemd for BeagleboneBlack or in general? > Or can you point me to any document/website/blog which explains this ? > > Thank you, > > Regards, > Ankur > > > > >
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