I am re basing kernel from 4.19 to 5.10 for our customized am335x board
In 4.19 "customize_machine" was executing fast and random number generator executing after some time
as in log
[ 0.100390] calling customize_machine+0x0/0x38 @ 1
[ 0.103268] audit: type=2000 audit(0.092:1): state=initialized audit_enabled=0 res=1
[ 0.105919] OMAP GPIO hardware version 0.1
[ 0.106057] probe of 44e07000.gpio returned 1 after 0 usecs
[ 0.107064] probe of 4804c000.gpio returned 1 after 0 usecs
[ 0.108112] probe of 481ac000.gpio returned 1 after 0 usecs
[ 0.109061] probe of 481ae000.gpio returned 1 after 0 usecs
[ 0.114144] probe of 50000000.gpmc returned 0 after 0 usecs
[ 0.115921] initcall customize_machine+0x0/0x38 returned 0 after 15625 usecs
[ 0.115939] calling init_atags_procfs+0x0/0x110 @ 1
[ 0.610968] calling omap_rng_driver_init+0x0/0x28 @ 1
[ 0.611885] omap_rng 48310000.rng: Random Number Generator ver. 20
[ 0.611940] probe of 48310000.rng returned 1 after 777 usecs
[ 0.612020] initcall omap_rng_driver_init+0x0/0x28 returned 0 after 1008 usecs
[ 0.612029] calling drm_kms_helper_init+0x0/0x28 @ 1
[ 0.612075] initcall drm_kms_helper_init+0x0/0x28 returned 0 after 35 usecs
[ 0.612082] calling drm_core_init+0x0/0xf8 @ 1
[ 0.612160] initcall drm_core_init+0x0/0xf8 returned 0 after 64 usecs
[ 0.612169] calling tilcdc_drm_init+0x0/0x40 @ 1
[ 0.612782] probe of panel returned 1 after 347 usecs
[ 0.614254] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 0.614263] [drm] No driver support for vblank timestamp query.
[ 0.614452] random: fast init done
[ 0.614594] random: crng init done
but in 5.10 "customize_machine" taking more time and random init "random: fast init done"
occurring in between "customize_machine" because of that it taking 1 second extra to boot
as in log
[ 0.042043] calling customize_machine+0x0/0x30 @ 1
[ 0.048436] audit: type=2000 audit(0.032:1): state=initialized audit_enabled=0 res=1
[ 1.032405] random: fast init done
[ 1.042450] initcall customize_machine+0x0/0x30 returned 0 after 976562 usecs
[ 1.042469] calling init_atags_procfs+0x0/0x108 @ 1
[ 1.722308] calling omap_rng_driver_init+0x0/0x20 @ 1
[ 1.723237] omap_rng 48310000.rng: Random Number Generator ver. 20
[ 1.723398] initcall omap_rng_driver_init+0x0/0x20 returned 0 after 1041 usecs
[ 1.723411] calling drm_kms_helper_init+0x0/0x20 @ 1
[ 1.723453] initcall drm_kms_helper_init+0x0/0x20 returned 0 after 32 usecs
[ 1.723462] calling drm_core_init+0x0/0xc8 @ 1
[ 1.723545] initcall drm_core_init+0x0/0xc8 returned 0 after 68 usecs
[ 1.723556] calling tilcdc_drm_init+0x0/0x34 @ 1
[ 1.725869] random: crng init done
any suggestion to reduce time in "customize_machine" and call "random: fast init done" after some time