upstream u-boot with additional patches for our devices/boards: https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ; Gbit ethernet patch for some LIME2 revisions ; with SPI flash support
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u-boot/arch/openrisc/include/asm/bitops/fls.h

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/*
* OpenRISC Linux
*
* Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __ASM_OPENRISC_FLS_H
#define __ASM_OPENRISC_FLS_H
static inline int fls(int x)
{
int ret;
__asm__ ("l.fl1 %0,%1"
: "=r" (ret)
: "r" (x));
return ret;
}
#endif /* __ASM_OPENRISC_FLS_H */