diff options
| -rw-r--r-- | Kconfig | 12 | ||||
| -rw-r--r-- | common/board_f.c | 11 |
2 files changed, 22 insertions, 1 deletions
@@ -474,6 +474,18 @@ config SKIP_RELOCATE Skips relocation of U-Boot allowing for systems that have extremely limited RAM to run U-Boot. +config SKIP_EARLY_DM + bool "Skips initialising device model pre-relocation" + help + Enable this option to skip scanning and probing devices prior to + U-Boot relocation (during board_f). Unless console support is disabled + a serial port is still required, however this can be found through + /chosen/stdout-path in FDT. If the serial port relies on other devices + like clocks these will also be bound and probed on demand. + + This can speed up time to interactive console by about 50%, particularly + when combined with OF_LIVE. + endif # EXPERT config PHYS_64BIT diff --git a/common/board_f.c b/common/board_f.c index df2b0dc899b..2713438cc18 100644 --- a/common/board_f.c +++ b/common/board_f.c @@ -814,7 +814,16 @@ static int initf_dm(void) return 0; bootstage_start(BOOTSTAGE_ID_ACCUM_DM_F, "dm_f"); - ret = dm_init_and_scan(true); + + /* + * If SKIP_EARLY_DM is set then we just create an empty device + * model, the serial port will still be bound later through + * serial_find_console_or_panic() via /chosen/stdout-path + */ + if (!CONFIG_IS_ENABLED(SKIP_EARLY_DM)) + ret = dm_init_and_scan(true); + else + ret = dm_init(false); if (ret) return ret; |