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@@ -9,6 +9,8 @@
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#define _ASM_ARCH_SPL_H_
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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_HEADER_VERSION 1
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/* boot head definition from sun4i boot code */
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struct boot_file_head {
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@@ -21,8 +23,23 @@ struct boot_file_head {
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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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- uint8_t pad[12]; /* align to 32 bytes */
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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;
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+ uint32_t reserved; /* padding, align to 32 bytes */
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};
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#endif
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