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