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/board/calao/sbc35_a9g20/spi.c

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/*
* Copyright (C) 2009
* Albin Tonnerre, Free Electrons <albin.tonnerre@free-electrons.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_spi.h>
#include <asm/arch/gpio.h>
#include <spi.h>
#define SBC_A9260_CS0_PIN AT91_PIN_PA3
#define SBC_A9260_CS1_PIN AT91_PIN_PC11
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return bus == 0 && (cs == 1 || cs == 0);
}
void spi_cs_activate(struct spi_slave *slave)
{
if(slave->cs == 0)
at91_set_gpio_value(SBC_A9260_CS0_PIN, 0);
else if(slave->cs == 1)
at91_set_gpio_value(SBC_A9260_CS1_PIN, 0);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
if(slave->cs == 0)
at91_set_gpio_value(SBC_A9260_CS0_PIN, 1);
else if(slave->cs == 1)
at91_set_gpio_value(SBC_A9260_CS1_PIN, 1);
}
void spi_init_f(void)
{
/* everything done in board_init */
}