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sunxi_nand_spl: Be smarter about where to look for backup u-boot.bin

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We know when u-boot is written to its own partition, in this case the
layout always is:

eb 0 spl
eb 1 spl-backup
eb 2 u-boot
eb 3 u-boot-backup

eb: erase-block

So if we cannot load u-boot from its primary offset we know exactly where
to look for it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
This commit is contained in:
Hans de Goede 2015-08-31 16:00:56 +02:00
parent f3b589c09b
commit 31c5614af4
1 changed files with 20 additions and 6 deletions
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26
drivers/mtd/nand/sunxi_nand_spl.c
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@ -356,18 +356,32 @@ static int nand_read_buffer(uint32_t offs, unsigned int size, void *dest,
int nand_spl_load_image(uint32_t offs, unsigned int size, void *dest)
{
#if CONFIG_SYS_NAND_U_BOOT_OFFS == CONFIG_SPL_PAD_TO
/*
* u-boot-dtb.bin appended to SPL, use syndrome (like the BROM does)
* and try different erase block sizes to find the backup.
*/
const uint32_t boot_offsets[] = {
0 * 1024 * 1024 + CONFIG_SYS_NAND_U_BOOT_OFFS,
1 * 1024 * 1024 + CONFIG_SYS_NAND_U_BOOT_OFFS,
2 * 1024 * 1024 + CONFIG_SYS_NAND_U_BOOT_OFFS,
4 * 1024 * 1024 + CONFIG_SYS_NAND_U_BOOT_OFFS,
};
int i, syndrome;
if (CONFIG_SYS_NAND_U_BOOT_OFFS == CONFIG_SPL_PAD_TO)
syndrome = 1; /* u-boot-dtb.bin appended to SPL */
else
syndrome = 0; /* u-boot-dtb.bin on its own partition */
const int syndrome = 1;
#else
/*
* u-boot-dtb.bin on its own partition, do not use syndrome, u-boot
* partition sits after 2 eraseblocks (spl, spl-backup), look for
* backup u-boot 1 erase block further.
*/
const uint32_t eraseblock_size = CONFIG_SYS_NAND_U_BOOT_OFFS / 2;
const uint32_t boot_offsets[] = {
CONFIG_SYS_NAND_U_BOOT_OFFS,
CONFIG_SYS_NAND_U_BOOT_OFFS + eraseblock_size,
};
const int syndrome = 0;
#endif
int i;
if (offs == CONFIG_SYS_NAND_U_BOOT_OFFS) {
for (i = 0; i < ARRAY_SIZE(boot_offsets); i++) {