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driver/cfi-flash: Add a config option for the page size of CFI flash.

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We have added a defconfig configuration to set the page size of the flash.
According to the CFI protocol, the flash supports a single write operation
with a data volume ranging from byte size up to the maximum number of bytes.
However, the MTD device structure requires defining a page size, which serves
as the minimum write unit of the flash. Hence, this configuration is introduced.
Any page size within the range of 1 to the maximum number of bytes is considered
valid.

Signed-off-by: jingfei <jingfei@xiaomi.com>
This commit is contained in:
jingfei
2025-08-20 19:42:53 +08:00
committed by Xiang Xiao
parent ad3abcd277
commit 9483df3571
2 changed files with 16 additions and 2 deletions
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13
drivers/mtd/Kconfig
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@@ -1495,4 +1495,17 @@ config MTD_CFI
---help---
Support CFI(common flash interface) NOR FLASH.
config MTD_CFI_PAGE_SIZE
int "Page Size of MTD CFI NOR FLASH (bytes)"
default 16
range 1 524288
depends on MTD_CFI
---help---
Configure the write page size (in bytes) used by the CFI NOR Flash
driver. The value must be at least 1 and should not exceed the maximum
write buffer size supported by the CFI device.
In the driver, this capability is typically exposed as the device's
"write page size" parameter for each write, so this configuration
value should be chosen such that it is equal to write page size for
the target flash.
endif # MTD

5
drivers/mtd/cfi.c
View File

@@ -969,8 +969,9 @@ int cfi_check(FAR struct cfi_dev_s *cfi)
cfi->cfi_offset = g_cfi_query_address[i];
cfi->dev_num = cfi->bankwidth / cfi->dev_width;
cfi->page_size = (1 << info->max_write_bytes_num) *
cfi->dev_num;
cfi->page_size = MIN(CONFIG_MTD_CFI_PAGE_SIZE,
(1 << info->max_write_bytes_num) *
cfi->dev_num);
/* fix amd feature */