Atmosphère supports customizing CFW behavior based on the presence of flags on the SD card.
The following flags are supported on a per-title basis, by placing <flag_name>.flag inside /atmosphere/titles/<title_id>/flags/:
boot2, which indicates to PM that the title should be launched during the boot2 process.fsmitm, which indicates that fs.mitm should override contents for the title even if it otherwise wouldn't.fsmitm_disable, which indicates that fs.mitm should not override contents for the title, even it it otherwise would.bis_write, which indicates that fs.mitm should allow the title to write to BIS partitions.cal_read, which indicates that fs.mitm should allow the title to read the CAL0/PRODINFO partition.The following global flags are supported, by placing <flag name>.flag inside /atmosphere/flags/:
hbl_bis_write and hbl_cal_read enable the BIS write and CAL0 read functionality for HBL, without needing to specify its title id.