diff options
Diffstat (limited to 'src/mainboard')
| -rw-r--r-- | src/mainboard/google/snow/romstage.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/src/mainboard/google/snow/romstage.c b/src/mainboard/google/snow/romstage.c index c2f5fc9f0a..ea2feec782 100644 --- a/src/mainboard/google/snow/romstage.c +++ b/src/mainboard/google/snow/romstage.c @@ -52,6 +52,20 @@ static int board_wakeup_permitted(void) } #endif +/* + * Set/clear program flow prediction and return the previous state. + */ +static int config_branch_prediction(int set_cr_z) +{ + unsigned int cr; + + /* System Control Register: 11th bit Z Branch prediction enable */ + cr = get_cr(); + set_cr(set_cr_z ? cr | CR_Z : cr & ~CR_Z); + + return cr & CR_Z; +} + static void initialize_s5p_mshc(void) { /* MMC0: Fixed, 8 bit mode, connected with GPIO. */ @@ -81,6 +95,10 @@ void main(void) int ret; void *entry; + /* FIXME: if we boot from USB, we need to disable branch prediction + * before copying from USB into RAM */ + config_branch_prediction(1); + clock_set_rate(PERIPH_ID_SPI1, 50000000); /* set spi clock to 50Mhz */ /* Clock must be initialized before console_init, otherwise you may need |