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/arc/cpu/arcv1/ivt.S

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/*
* Copyright (C) 2013-2014 Synopsys, Inc. All rights reserved.
*
* SPDX-License-Identifier: GPL-2.0+
*/
.section .ivt, "ax",@progbits
.align 4
_ivt:
/* Critical system events */
j _start /* 0 - 0x000 */
j memory_error /* 1 - 0x008 */
j instruction_error /* 2 - 0x010 */
/* Device interrupts */
.rept 29
j interrupt_handler /* 3:31 - 0x018:0xF8 */
.endr
/* Exceptions */
j EV_MachineCheck /* 0x100, Fatal Machine check (0x20) */
j EV_TLBMissI /* 0x108, Intruction TLB miss (0x21) */
j EV_TLBMissD /* 0x110, Data TLB miss (0x22) */
j EV_TLBProtV /* 0x118, Protection Violation (0x23)
or Misaligned Access */
j EV_PrivilegeV /* 0x120, Privilege Violation (0x24) */
j EV_Trap /* 0x128, Trap exception (0x25) */
j EV_Extension /* 0x130, Extn Intruction Excp (0x26) */