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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 <tglx@linutronix.de> Signed-off-by: Ladislav Michl <ladis@linux-mips.org> Acked-by: Heiko Schocher <hs@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com>
136 lines
4.3 KiB
C
136 lines
4.3 KiB
C
/*
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* Copyright (c) Thomas Gleixner <tglx@linutronix.de>
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*
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* SPDX-License-Identifier: GPL 2.0+ BSD-3-Clause
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*/
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#ifndef _UBOOT_MTD_UBISPL_H
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#define _UBOOT_MTD_UBISPL_H
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#include "../ubi/ubi-media.h"
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#include "ubi-wrapper.h"
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/*
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* The maximum number of volume ids we scan. So you can load volume id
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* 0 to (CONFIG_SPL_UBI_VOL_ID_MAX - 1)
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*/
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#define UBI_SPL_VOL_IDS CONFIG_SPL_UBI_VOL_IDS
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/*
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* The size of the read buffer for the fastmap blocks. In theory up to
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* UBI_FM_MAX_BLOCKS * CONFIG_SPL_MAX_PEB_SIZE. In practice today
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* one or two blocks.
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*/
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#define UBI_FM_BUF_SIZE (UBI_FM_MAX_BLOCKS*CONFIG_SPL_UBI_MAX_PEB_SIZE)
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/*
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* The size of the bitmaps for the attach/ scan
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*/
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#define UBI_FM_BM_SIZE ((CONFIG_SPL_UBI_MAX_PEBS / BITS_PER_LONG) + 1)
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/*
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* The maximum number of logical erase blocks per loadable volume
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*/
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#define UBI_MAX_VOL_LEBS CONFIG_SPL_UBI_MAX_VOL_LEBS
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/*
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* The bitmap size for the above to denote the found blocks inside the volume
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*/
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#define UBI_VOL_BM_SIZE ((UBI_MAX_VOL_LEBS / BITS_PER_LONG) + 1)
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/**
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* struct ubi_vol_info - UBISPL internal volume represenation
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* @last_block: The last block (highest LEB) found for this volume
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* @found: Bitmap to mark found LEBS
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* @lebs_to_pebs: LEB to PEB translation table
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*/
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struct ubi_vol_info {
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u32 last_block;
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unsigned long found[UBI_VOL_BM_SIZE];
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u32 lebs_to_pebs[UBI_MAX_VOL_LEBS];
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};
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/**
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* struct ubi_scan_info - UBISPL internal data for FM attach and full scan
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*
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* @read: Read function to access the flash provided by the caller
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* @peb_count: Number of physical erase blocks in the UBI FLASH area
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* aka MTD partition.
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* @peb_offset: Offset of PEB0 in the UBI FLASH area (aka MTD partition)
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* to the real start of the FLASH in erase blocks.
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* @fsize_mb: Size of the scanned FLASH area in MB (stats only)
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* @vid_offset: Offset from the start of a PEB to the VID header
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* @leb_start: Offset from the start of a PEB to the data area
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* @leb_size: Size of the data area
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*
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* @fastmap_pebs: Counter of PEBs "attached" by fastmap
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* @fastmap_anchor: The anchor PEB of the fastmap
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* @fm_sb: The fastmap super block data
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* @fm_vh: The fastmap VID header
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* @fm: Pointer to the fastmap layout
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* @fm_layout: The fastmap layout itself
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* @fm_pool: The pool of PEBs to scan at fastmap attach time
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* @fm_wl_pool: The pool of PEBs scheduled for wearleveling
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*
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* @fm_enabled: Indicator whether fastmap attachment is enabled.
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* @fm_used: Bitmap to indicate the PEBS covered by fastmap
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* @scanned: Bitmap to indicate the PEBS of which the VID header
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* hase been physically scanned.
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* @corrupt: Bitmap to indicate corrupt blocks
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* @toload: Bitmap to indicate the volumes which should be loaded
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*
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* @blockinfo: The vid headers of the scanned blocks
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* @volinfo: The volume information of the interesting (toload)
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* volumes
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*
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* @fm_buf: The large fastmap attach buffer
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*/
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struct ubi_scan_info {
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ubispl_read_flash read;
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unsigned int fsize_mb;
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unsigned int peb_count;
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unsigned int peb_offset;
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unsigned long vid_offset;
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unsigned long leb_start;
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unsigned long leb_size;
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/* Fastmap: The upstream required fields */
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int fastmap_pebs;
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int fastmap_anchor;
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size_t fm_size;
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struct ubi_fm_sb fm_sb;
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struct ubi_vid_hdr fm_vh;
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struct ubi_fastmap_layout *fm;
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struct ubi_fastmap_layout fm_layout;
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struct ubi_fm_pool fm_pool;
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struct ubi_fm_pool fm_wl_pool;
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/* Fastmap: UBISPL specific data */
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int fm_enabled;
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unsigned long fm_used[UBI_FM_BM_SIZE];
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unsigned long scanned[UBI_FM_BM_SIZE];
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unsigned long corrupt[UBI_FM_BM_SIZE];
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unsigned long toload[UBI_FM_BM_SIZE];
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/* Data for storing the VID and volume information */
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struct ubi_vol_info volinfo[UBI_SPL_VOL_IDS];
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struct ubi_vid_hdr blockinfo[CONFIG_SPL_UBI_MAX_PEBS];
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/* The large buffer for the fastmap */
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uint8_t fm_buf[UBI_FM_BUF_SIZE];
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};
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#ifdef CFG_DEBUG
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#define ubi_dbg(fmt, ...) printf("UBI: debug:" fmt "\n", ##__VA_ARGS__)
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#else
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#define ubi_dbg(fmt, ...)
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#endif
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#ifdef CONFIG_UBI_SILENCE_MSG
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#define ubi_msg(fmt, ...)
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#else
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#define ubi_msg(fmt, ...) printf("UBI: " fmt "\n", ##__VA_ARGS__)
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#endif
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/* UBI warning messages */
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#define ubi_warn(fmt, ...) printf("UBI warning: " fmt "\n", ##__VA_ARGS__)
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/* UBI error messages */
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#define ubi_err(fmt, ...) printf("UBI error: " fmt "\n", ##__VA_ARGS__)
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#endif
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