On Tue, 05 May 2020 00:18:45 PDT (-0700), sagar.kadam@xxxxxxxxxx wrote:
Hello Palmer,
-----Original Message-----
From: Palmer Dabbelt <palmer@xxxxxxxxxxx>
Sent: Tuesday, May 5, 2020 3:40 AM
To: Sagar Kadam <sagar.kadam@xxxxxxxxxx>
Cc: tudor.ambarus@xxxxxxxxxxxxx; miquel.raynal@xxxxxxxxxxx;
richard@xxxxxx; vigneshr@xxxxxx; Paul Walmsley
<paul.walmsley@xxxxxxxxxx>; linux-riscv@xxxxxxxxxxxxxxxxxxx; linux-
kernel@xxxxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx; Sagar Kadam
<sagar.kadam@xxxxxxxxxx>
Subject: Re: [PATCH 1/2] riscv: defconfig: enable spi nor on Hifive Unleashed
A00 board.
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On Thu, 30 Apr 2020 02:58:51 PDT (-0700), sagar.kadam@xxxxxxxxxx wrote:
> Enable MTD based SPI-NOR framework in order to use spi flash available
> on HiFive Unleashed A00 board.
>
> Signed-off-by: Sagar Shrikant Kadam <sagar.kadam@xxxxxxxxxx>
> ---
> arch/riscv/configs/defconfig | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/configs/defconfig
> b/arch/riscv/configs/defconfig index 4da4886..970580b 100644
> --- a/arch/riscv/configs/defconfig
> +++ b/arch/riscv/configs/defconfig
> @@ -80,6 +80,8 @@ CONFIG_USB_STORAGE=y CONFIG_USB_UAS=y
CONFIG_MMC=y
> CONFIG_MMC_SPI=y
> +CONFIG_MTD=y
> +CONFIG_MTD_SPI_NOR=y
> CONFIG_RTC_CLASS=y
> CONFIG_VIRTIO_PCI=y
> CONFIG_VIRTIO_BALLOON=y
From the second patch's description I'm assuming that MTD still functions
correctly without that change?
Yes Palmer, the second patch is to enable QUAD write to nor flash..
MTD function's correctly without second patch.
Using the character interface (/dev/mtd0) mtd_utils (mtd_debug : erase/read/write) work fine.
We might require CONFIG_MTD_BLOCK, CONFIG_MTD_CMDLINE_PARTS in order to use MTD partitioning.
IMHO it can be at user's choice weather to use flash partitions or not, so I have not enabled. Please let me
know if I should enable these features as well.
Looks like arm64 has these:
arch/arm64/configs/defconfig:CONFIG_MTD=y
arch/arm64/configs/defconfig:CONFIG_MTD_BLOCK=y
arch/arm64/configs/defconfig:CONFIG_MTD_CFI=y
arch/arm64/configs/defconfig:CONFIG_MTD_CFI_ADV_OPTIONS=y
arch/arm64/configs/defconfig:CONFIG_MTD_CFI_INTELEXT=y
arch/arm64/configs/defconfig:CONFIG_MTD_CFI_AMDSTD=y
arch/arm64/configs/defconfig:CONFIG_MTD_CFI_STAA=y
arch/arm64/configs/defconfig:CONFIG_MTD_PHYSMAP=y
arch/arm64/configs/defconfig:CONFIG_MTD_PHYSMAP_OF=y
arch/arm64/configs/defconfig:CONFIG_MTD_DATAFLASH=y
arch/arm64/configs/defconfig:CONFIG_MTD_SST25L=y
arch/arm64/configs/defconfig:CONFIG_MTD_RAW_NAND=y
arch/arm64/configs/defconfig:CONFIG_MTD_NAND_DENALI_DT=y
arch/arm64/configs/defconfig:CONFIG_MTD_NAND_MARVELL=y
arch/arm64/configs/defconfig:CONFIG_MTD_NAND_FSL_IFC=y
arch/arm64/configs/defconfig:CONFIG_MTD_NAND_QCOM=y
arch/arm64/configs/defconfig:CONFIG_MTD_SPI_NOR=y
so I think we're good with just what you have here: MTD_BLOCK doesn't seem that
useful, and the rest are drivers. That said, these (along with SPI and
SPI_SIFIVE) should really be in Kconfig.socs rather than defconfig. Can you
send a patch that does that?
To demonstrate a bit more with linux 5.7-rc3
Specify on U-boot prompt:
# setenv bootargs "root=/dev/ram rw console=ttySIF0 mtdparts=spi0.0:1024k(loader1),4096K(loader2),26M(rootfs)"
After booting linux will enumerate mtd partitions:
# cat /proc/mtd
dev: size erasesize name
mtd0: 00100000 00001000 "loader1"
mtd1: 00400000 00001000 "loader2"
mtd2: 01a00000 00001000 "rootfs"
# cat /proc/partitions
major minor #blocks name
31 0 1024 mtdblock0
31 1 4096 mtdblock1
31 2 26624 mtdblock2
#Format mtdblock2 with mkfs.ext3/4 and mount results in
# mkfs.ext3 /dev/mtdblock2
mke2fs 1.44.5 (15-Dec-2018)
/dev/mtdblock2 contains a ext3 file system
last mounted on /mnt on Thu Jan 1 00:00:14 1970
Proceed anyway? (y,N) y
Creating filesystem with 26624 1k blocks and 6656 inodes
Filesystem UUID: 1b09252d-e313-430c-9ecb-79b0cef003ca
Superblock backups stored on blocks:
8193, 24577
Allocating group tables: done
Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done
# mount
none on / type rootfs (rw)
proc on /proc type proc (rw,relatime)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=666)
tmpfs on /dev/shm type tmpfs (rw,relatime,mode=777)
tmpfs on /tmp type tmpfs (rw,relatime)
tmpfs on /run type tmpfs (rw,nosuid,nodev,relatime,mode=755)
sysfs on /sys type sysfs (rw,relatime)
/dev/mtdblock2 on /mnt type ext3 (rw,relatime)
Thanks & BR,
Sagar Kadam
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