* Based on code from LTIB:
* Copyright (C) 2010 Freescale Semiconductor, Inc.
*
- * See file CREDITS for list of people who contributed to this
- * project.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
- * MA 02111-1307 USA
+ * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
DECLARE_GLOBAL_DATA_PTR;
/* Lowlevel init isn't used on i.MX28, so just have a dummy here */
-inline void lowlevel_init(void) {}
+void lowlevel_init(void) {}
void reset_cpu(ulong ignored) __attribute__((noreturn));
#endif
}
+/*
+ * This function will craft a jumptable at 0x0 which will redirect interrupt
+ * vectoring to proper location of U-Boot in RAM.
+ *
+ * The structure of the jumptable will be as follows:
+ * ldr pc, [pc, #0x18] ..... for each vector, thus repeated 8 times
+ * <destination address> ... for each previous ldr, thus also repeated 8 times
+ *
+ * The "ldr pc, [pc, #0x18]" instruction above loads address from memory at
+ * offset 0x18 from current value of PC register. Note that PC is already
+ * incremented by 4 when computing the offset, so the effective offset is
+ * actually 0x20, this the associated <destination address>. Loading the PC
+ * register with an address performs a jump to that address.
+ */
void mx28_fixup_vt(uint32_t start_addr)
{
- uint32_t *vt = (uint32_t *)0x20;
+ /* ldr pc, [pc, #0x18] */
+ const uint32_t ldr_pc = 0xe59ff018;
+ /* Jumptable location is 0x0 */
+ uint32_t *vt = (uint32_t *)0x0;
int i;
- for (i = 0; i < 8; i++)
- vt[i] = start_addr + (4 * i);
+ for (i = 0; i < 8; i++) {
+ /* cppcheck-suppress nullPointer */
+ vt[i] = ldr_pc;
+ /* cppcheck-suppress nullPointer */
+ vt[i + 8] = start_addr + (4 * i);
+ }
}
#ifdef CONFIG_ARCH_MISC_INIT