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sunxi: Extend SPL header versioning

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On Allwinner SoCs we use some free bytes at the beginning of the SPL image
to store various information. We have a version byte to allow updates,
but changing this always requires all tools to be updated as well.

Introduce the concept of semantic versioning [1] to the SPL header:
The major part of the version number only changes on incompatible
updates, a minor number bump indicates backward compatibility.
This patch just documents the major/minor split, adds some comments
to the header file and uses the versioning information for the existing
users.

[1] https://semver.org

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Acked-by: Jagan Teki <jagan@openedev.com>
This commit is contained in:
Andre Przywara
2018-10-25 17:23:03 +08:00
committed by Jagan Teki
parent c6c2c85e4b
commit 55d481d201
2 changed files with 16 additions and 7 deletions
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19
arch/arm/include/asm/arch-sunxi/spl.h
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@@ -9,7 +9,16 @@
#define BOOT0_MAGIC "eGON.BT0"
#define SPL_SIGNATURE "SPL" /* marks "sunxi" SPL header */
#define SPL_HEADER_VERSION 2
#define SPL_MAJOR_BITS 3
#define SPL_MINOR_BITS 5
#define SPL_VERSION(maj, min) \
((((maj) & ((1U << SPL_MAJOR_BITS) - 1)) << SPL_MINOR_BITS) | \
((min) & ((1U << SPL_MINOR_BITS) - 1)))
#define SPL_HEADER_VERSION SPL_VERSION(0, 2)
#define SPL_ENV_HEADER_VERSION SPL_VERSION(0, 1)
#define SPL_DT_HEADER_VERSION SPL_VERSION(0, 2)
#define SPL_ADDR CONFIG_SUNXI_SRAM_ADDRESS
@@ -45,14 +54,14 @@ struct boot_file_head {
uint32_t pub_head_size;
uint8_t spl_signature[4];
};
uint32_t fel_script_address;
uint32_t fel_script_address; /* since v0.1, set by sunxi-fel */
/*
* If the fel_uEnv_length member below is set to a non-zero value,
* it specifies the size (byte count) of data at fel_script_address.
* At the same time this indicates that the data is in uEnv.txt
* compatible format, ready to be imported via "env import -t".
*/
uint32_t fel_uEnv_length;
uint32_t fel_uEnv_length; /* since v0.1, set by sunxi-fel */
/*
* Offset of an ASCIIZ string (relative to the SPL header), which
* contains the default device tree name (CONFIG_DEFAULT_DEVICE_TREE).
@@ -60,11 +69,11 @@ struct boot_file_head {
* by flash programming tools for providing nice informative messages
* to the users.
*/
uint32_t dt_name_offset;
uint32_t dt_name_offset; /* since v0.2, set by mksunxiboot */
uint32_t reserved1;
uint32_t boot_media; /* written here by the boot ROM */
/* A padding area (may be used for storing text strings) */
uint32_t string_pool[13];
uint32_t string_pool[13]; /* since v0.2, filled by mksunxiboot */
/* The header must be a multiple of 32 bytes (for VBAR alignment) */
};