GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2019 NXP
+ */
+
+#include <config.h>
+
+.align 8
+.global boot_pointer
+boot_pointer:
+	.space 32
+
+/*
+ * Routine: save_boot_params (called after reset from start.S)
+ */
+
+.global save_boot_params
+save_boot_params:
+	/* The firmware provided ATAG/FDT address can be found in r2/x0 */
+	adr	x0, boot_pointer
+	stp	x1, x2, [x0], #16
+	stp	x3, x4, [x0], #16
+
+	/*
+	 * We use absolute address not PC relative address for return.
+	 * When running SPL on iMX8, the A core starts at address 0,
+	 * an alias to OCRAM 0x100000, our linker address for SPL is
+	 * from 0x100000. So using absolute address can jump to the OCRAM
+	 * address from the alias. The alias only map first 96KB of OCRAM,
+	 * so this require the SPL size can't beyond 96KB.
+	 * But when using SPL DM, the size increase significantly and
+	 * always beyonds 96KB. That's why we have to jump to OCRAM.
+	 * Normal u-boot also runs into this codes, but there is no impact.
+	 */
+	ldr	x1, =save_boot_params_ret
+	br	x1