nand_spl_loaders.c
2.91 KB
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int nand_spl_load_image(uint32_t offs, unsigned int size, void *dst)
{
unsigned int block, lastblock;
unsigned int page, page_offset;
/* offs has to be aligned to a page address! */
block = offs / CONFIG_SYS_NAND_BLOCK_SIZE;
lastblock = (offs + size - 1) / CONFIG_SYS_NAND_BLOCK_SIZE;
page = (offs % CONFIG_SYS_NAND_BLOCK_SIZE) / CONFIG_SYS_NAND_PAGE_SIZE;
page_offset = offs % CONFIG_SYS_NAND_PAGE_SIZE;
while (block <= lastblock) {
if (!nand_is_bad_block(block)) {
/* Skip bad blocks */
while (page < CONFIG_SYS_NAND_PAGE_COUNT) {
nand_read_page(block, page, dst);
/*
* When offs is not aligned to page address the
* extra offset is copied to dst as well. Copy
* the image such that its first byte will be
* at the dst.
*/
if (unlikely(page_offset)) {
memmove(dst, dst + page_offset,
CONFIG_SYS_NAND_PAGE_SIZE);
dst = (void *)((int)dst - page_offset);
page_offset = 0;
}
dst += CONFIG_SYS_NAND_PAGE_SIZE;
page++;
}
page = 0;
} else {
lastblock++;
}
block++;
}
return 0;
}
#ifdef CONFIG_SPL_UBI
/*
* Temporary storage for non NAND page aligned and non NAND page sized
* reads. Note: This does not support runtime detected FLASH yet, but
* that should be reasonably easy to fix by making the buffer large
* enough :)
*/
static u8 scratch_buf[CONFIG_SYS_NAND_PAGE_SIZE];
/**
* nand_spl_read_block - Read data from physical eraseblock into a buffer
* @block: Number of the physical eraseblock
* @offset: Data offset from the start of @peb
* @len: Data size to read
* @dst: Address of the destination buffer
*
* This could be further optimized if we'd have a subpage read
* function in the simple code. On NAND which allows subpage reads
* this would spare quite some time to readout e.g. the VID header of
* UBI.
*
* Notes:
* @offset + @len are not allowed to be larger than a physical
* erase block. No sanity check done for simplicity reasons.
*
* To support runtime detected flash this needs to be extended by
* information about the actual flash geometry, but thats beyond the
* scope of this effort and for most applications where fast boot is
* required it is not an issue anyway.
*/
int nand_spl_read_block(int block, int offset, int len, void *dst)
{
int page, read;
/* Calculate the page number */
page = offset / CONFIG_SYS_NAND_PAGE_SIZE;
/* Offset to the start of a flash page */
offset = offset % CONFIG_SYS_NAND_PAGE_SIZE;
while (len) {
/*
* Non page aligned reads go to the scratch buffer.
* Page aligned reads go directly to the destination.
*/
if (offset || len < CONFIG_SYS_NAND_PAGE_SIZE) {
nand_read_page(block, page, scratch_buf);
read = min(len, CONFIG_SYS_NAND_PAGE_SIZE - offset);
memcpy(dst, scratch_buf + offset, read);
offset = 0;
} else {
nand_read_page(block, page, dst);
read = CONFIG_SYS_NAND_PAGE_SIZE;
}
page++;
len -= read;
dst += read;
}
return 0;
}
#endif