7e20e4ab96
Refreshed all patches. Removed upstreamed hunks in: - 703-phy-support-layerscape.patch Compile-tested on: ar71xx, layerscape Runtime-tested on: ar71xx Signed-off-by: Koen Vandeputte <koen.vandeputte@ncentric.com>
56 lines
2.1 KiB
Diff
56 lines
2.1 KiB
Diff
From: Felix Fietkau <nbd@nbd.name>
|
|
Date: Sat, 4 Nov 2017 07:40:23 +0100
|
|
Subject: [PATCH] mtd: spi-nor: support limiting 4K sectors support based on
|
|
flash size
|
|
|
|
Some devices need 4K sectors to be able to deal with small flash chips.
|
|
For instance, w25x05 is 64 KiB in size, and without 4K sectors, the
|
|
entire chip is just one erase block.
|
|
On bigger flash chip sizes, using 4K sectors can significantly slow down
|
|
many operations, including using a writable filesystem. There are several
|
|
platforms where it makes sense to use a single kernel on both kinds of
|
|
devices.
|
|
|
|
To support this properly, allow configuring an upper flash chip size
|
|
limit for 4K sectors support.
|
|
|
|
Signed-off-by: Felix Fietkau <nbd@nbd.name>
|
|
---
|
|
|
|
--- a/drivers/mtd/spi-nor/Kconfig
|
|
+++ b/drivers/mtd/spi-nor/Kconfig
|
|
@@ -29,6 +29,17 @@ config MTD_SPI_NOR_USE_4K_SECTORS
|
|
Please note that some tools/drivers/filesystems may not work with
|
|
4096 B erase size (e.g. UBIFS requires 15 KiB as a minimum).
|
|
|
|
+config MTD_SPI_NOR_USE_4K_SECTORS_LIMIT
|
|
+ int "Maximum flash chip size to use 4K sectors on (in KiB)"
|
|
+ depends on MTD_SPI_NOR_USE_4K_SECTORS
|
|
+ default "4096"
|
|
+ help
|
|
+ There are many flash chips that support 4K sectors, but are so large
|
|
+ that using them significantly slows down writing large amounts of
|
|
+ data or using a writable filesystem.
|
|
+ Any flash chip larger than the size specified in this option will
|
|
+ not use 4K sectors.
|
|
+
|
|
config SPI_ATMEL_QUADSPI
|
|
tristate "Atmel Quad SPI Controller"
|
|
depends on ARCH_AT91 || (ARM && COMPILE_TEST)
|
|
--- a/drivers/mtd/spi-nor/spi-nor.c
|
|
+++ b/drivers/mtd/spi-nor/spi-nor.c
|
|
@@ -1648,10 +1648,12 @@ int spi_nor_scan(struct spi_nor *nor, co
|
|
|
|
#ifdef CONFIG_MTD_SPI_NOR_USE_4K_SECTORS
|
|
/* prefer "small sector" erase if possible */
|
|
- if (info->flags & SECT_4K) {
|
|
+ if ((info->flags & SECT_4K) && (mtd->size <=
|
|
+ CONFIG_MTD_SPI_NOR_USE_4K_SECTORS_LIMIT * 1024)) {
|
|
nor->erase_opcode = SPINOR_OP_BE_4K;
|
|
mtd->erasesize = 4096;
|
|
- } else if (info->flags & SECT_4K_PMC) {
|
|
+ } else if ((info->flags & SECT_4K_PMC) && (mtd->size <=
|
|
+ CONFIG_MTD_SPI_NOR_USE_4K_SECTORS_LIMIT * 1024)) {
|
|
nor->erase_opcode = SPINOR_OP_BE_4K_PMC;
|
|
mtd->erasesize = 4096;
|
|
} else
|