u-boot/board/google/gru/gru.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 Google
*/
#include <common.h>
#ifdef CONFIG_SPL_BUILD
/* provided to defeat compiler optimisation in board_init_f() */
void gru_dummy_function(int i)
{
}
int board_early_init_f(void)
{
# ifdef CONFIG_TARGET_CHROMEBOOK_BOB
int sum, i;
/*
* Add a delay and ensure that the compiler does not optimise this out.
* This is needed since the power rails tail a while to turn on, and
* we get garbage serial output otherwise.
*/
sum = 0;
for (i = 0; i < 150000; i++)
sum += i;
gru_dummy_function(sum);
#endif /* CONFIG_TARGET_CHROMEBOOK_BOB */
return 0;
}
#endif