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@@ -0,0 +1,81 @@
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+/* SPDX-License-Identifier: GPL-2.0+ */
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+/*
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+ * (C) Copyright 2007-2011
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+ * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
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+ * Tom Cubie <tangliang@allwinnertech.com>
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+ *
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+ * Constants and data structures used in Allwinner "eGON" images, as
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+ * parsed by the Boot-ROM.
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+ *
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+ * Shared between mkimage and the SPL.
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+ */
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+#ifndef SUNXI_IMAGE_H
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+#define SUNXI_IMAGE_H
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+
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+#define BOOT0_MAGIC "eGON.BT0"
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+#define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
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+#define SPL_MAJOR_BITS 3
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+#define SPL_MINOR_BITS 5
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+#define SPL_VERSION(maj, min) \
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+ ((((maj) & ((1U << SPL_MAJOR_BITS) - 1)) << SPL_MINOR_BITS) | \
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+ ((min) & ((1U << SPL_MINOR_BITS) - 1)))
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+
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+#define SPL_HEADER_VERSION SPL_VERSION(0, 2)
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+
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+#define SPL_ENV_HEADER_VERSION SPL_VERSION(0, 1)
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+#define SPL_DT_HEADER_VERSION SPL_VERSION(0, 2)
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+#define SPL_DRAM_HEADER_VERSION SPL_VERSION(0, 3)
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+
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+/* boot head definition from sun4i boot code */
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+struct boot_file_head {
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+ uint32_t b_instruction; /* one intruction jumping to real code */
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+ uint8_t magic[8]; /* ="eGON.BT0" or "eGON.BT1", not C-style str */
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+ uint32_t check_sum; /* generated by PC */
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+ uint32_t length; /* generated by PC */
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+ /*
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+ * We use a simplified header, only filling in what is needed
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+ * by the boot ROM. To be compatible with Allwinner tools we
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+ * would need to implement the proper fields here instead of
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+ * padding.
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+ *
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+ * Actually we want the ability to recognize our "sunxi" variant
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+ * of the SPL. To do so, let's place a special signature into the
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+ * "pub_head_size" field. We can reasonably expect Allwinner's
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+ * boot0 to always have the upper 16 bits of this set to 0 (after
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+ * all the value shouldn't be larger than the limit imposed by
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+ * SRAM size).
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+ * If the signature is present (at 0x14), then we know it's safe
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+ * to use the remaining 8 bytes (at 0x18) for our own purposes.
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+ * (E.g. sunxi-tools "fel" utility can pass information there.)
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+ */
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+ union {
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+ uint32_t pub_head_size;
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+ uint8_t spl_signature[4];
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+ };
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+ uint32_t fel_script_address; /* since v0.1, set by sunxi-fel */
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+ /*
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+ * If the fel_uEnv_length member below is set to a non-zero value,
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+ * it specifies the size (byte count) of data at fel_script_address.
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+ * At the same time this indicates that the data is in uEnv.txt
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+ * compatible format, ready to be imported via "env import -t".
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+ */
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+ uint32_t fel_uEnv_length; /* since v0.1, set by sunxi-fel */
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+ /*
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+ * Offset of an ASCIIZ string (relative to the SPL header), which
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+ * contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE).
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+ * This is optional and may be set to NULL. Is intended to be used
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+ * by flash programming tools for providing nice informative messages
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+ * to the users.
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+ */
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+ uint32_t dt_name_offset; /* since v0.2, set by mksunxiboot */
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+ uint32_t dram_size; /* in MiB, since v0.3, set by SPL */
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+ uint32_t boot_media; /* written here by the boot ROM */
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+ /* A padding area (may be used for storing text strings) */
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+ uint32_t string_pool[13]; /* since v0.2, filled by mksunxiboot */
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+ /* The header must be a multiple of 32 bytes (for VBAR alignment) */
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+};
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+
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+/* Compile time check to assure proper alignment of structure */
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+typedef char boot_file_head_not_multiple_of_32[1 - 2*(sizeof(struct boot_file_head) % 32)];
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+
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+#endif
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