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/examples/standalone/hello_world.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#include <common.h>
#include <exports.h>
int hello_world (int argc, char * const argv[])
{
int i;
/* Print the ABI version */
app_startup(argv);
printf ("Example expects ABI version %d\n", XF_VERSION);
printf ("Actual U-Boot ABI version %d\n", (int)get_version());
printf ("Hello World\n");
printf ("argc = %d\n", argc);
for (i=0; i<=argc; ++i) {
printf ("argv[%d] = \"%s\"\n",
i,
argv[i] ? argv[i] : "<NULL>");
}
printf ("Hit any key to exit ... ");
while (!tstc())
;
/* consume input */
(void) getc();
printf ("\n\n");
return (0);
}