On Tue, Jul 12, 2016 at 08:28:12PM +0200, Ladislav Michl wrote: > From: Thomas Gleixner <[email protected]> > > Booting a payload out of NAND FLASH from the SPL is a crux today, as > it requires hard partioned FLASH. Not a brilliant idea with the > reliability of todays NAND FLASH chips. > > The upstream UBI + UBI fastmap implementation which is about to > brought to u-boot is too heavy weight for SPLs as it provides way more > functionality than needed for a SPL and does not even fit into the > restricted SPL areas which are loaded from the SoC boot ROM. > > So this provides a fast and lightweight implementation of UBI scanning > and UBI fastmap attach. The scan and logical to physical block mapping > code is developed from scratch, while the fastmap implementation is > lifted from the linux kernel source and stripped down to fit the SPL > needs. > > The text foot print on the board which I used for development is: > > 6854 0 0 6854 1abd > drivers/mtd/ubispl/built-in.o > > Attaching a NAND chip with 4096 physical eraseblocks (4 blocks are > reserved for the SPL) takes: > > In full scan mode: 1172ms > In fastmap mode: 95ms > > The code requires quite some storage. The largest and unknown part of > it is the number of fastmap blocks to read. Therefor the data > structure is not put into the BSS. The code requires a pointer to free > memory handed in which is initialized by the UBI attach code itself. > > See doc/README.ubispl for further information on how to use it. > > This shares the ubi-media.h and crc32 implementation of drivers/mtd/ubi > There is no way to share the fastmap code, as UBISPL only utilizes the > slightly modified functions ubi_attach_fastmap() and ubi_scan_fastmap() > from the original kernel ubi fastmap implementation. > > Signed-off-by: Thomas Gleixner <[email protected]> > Signed-off-by: Ladislav Michl <[email protected]> > Acked-by: Heiko Schocher <[email protected]> > Reviewed-by: Tom Rini <[email protected]>
Applied to u-boot/master, thanks! -- Tom
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