diff options
Diffstat (limited to 'src/mainboard/google/hatch/variants/kohaku/ramstage.c')
| -rw-r--r-- | src/mainboard/google/hatch/variants/kohaku/ramstage.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/mainboard/google/hatch/variants/kohaku/ramstage.c b/src/mainboard/google/hatch/variants/kohaku/ramstage.c new file mode 100644 index 0000000000..9b919fccd8 --- /dev/null +++ b/src/mainboard/google/hatch/variants/kohaku/ramstage.c @@ -0,0 +1,32 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2019 Google LLC + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#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); +} |