diff options
Diffstat (limited to 'src/mainboard/google/hatch/variants/mushu/ramstage.c')
-rw-r--r-- | src/mainboard/google/hatch/variants/mushu/ramstage.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/mainboard/google/hatch/variants/mushu/ramstage.c b/src/mainboard/google/hatch/variants/mushu/ramstage.c new file mode 100644 index 0000000000..5459f55cd1 --- /dev/null +++ b/src/mainboard/google/hatch/variants/mushu/ramstage.c @@ -0,0 +1,25 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2020 The coreboot project Authors. + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include <delay.h> +#include <gpio.h> +#include <baseboard/variants.h> +#include <soc/gpio.h> + +void variant_ramstage_init(void) +{ + /* + * Enable power to FPMCU, wait for power rail to stabilize, + * and then deassert FPMCU reset. + * Waiting for the power rail to stabilize can take a while, + * a minimum of 400us on Kohaku. + */ + gpio_output(GPP_C11, 1); + mdelay(1); + gpio_output(GPP_A12, 1); +} |