[OpenWrt-Devel] [PATCH 1/2] imx6: bootscript: enable UBI fastmap support

[Koen Vandeputte]

On 03.10.19 00:21, Tim Harvey wrote:
> UBI Fastmap support is stable in the 4.4 kernel so lets take
> advantage of it to shave off 5-10 seconds of boot time.
>
> Signed-off-by: Tim Harvey <tharvey at gateworks.com>
> ---
>   target/linux/imx6/image/bootscript-ventana | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/target/linux/imx6/image/bootscript-ventana b/target/linux/imx6/image/bootscript-ventana
> index 941afb5..8451caf 100644
> --- a/target/linux/imx6/image/bootscript-ventana
> +++ b/target/linux/imx6/image/bootscript-ventana
> @@ -1,4 +1,4 @@
> -echo "Gateworks Ventana OpenWrt Boot script v1.01"
> +echo "Gateworks Ventana OpenWrt Boot script v1.02"
>   
>   # set some defaults
>   # set some defaults
> @@ -51,6 +51,8 @@ if itest.s "x${dtype}" == "xnand" ; then
>   	echo "mtdparts:${mtdparts}"
>   	setenv fsload ubifsload
>   	setenv root "ubi0:ubi ubi.mtd=2 rootfstype=squashfs,ubifs"
> +	# enable UBI fastmap support
> +	setenv bootargs "${bootargs} ubi.fm_autoconvert=1"
>   else
>   	echo "Booting from block device ${bootdev}..."
>   	setenv fsload "${fs}load ${dtype} ${disk}:1"

Hi Tim,

Shouldn't this patch also enable the required kernel symbol? 
(MTD_UBI_FASTMAP)

Next to that, even in kernel 4.19 I'm reading following regarding this 
feature:

Important: this feature is experimental so far and the on-flash │
format for fastmap may change in the next kernel versions


Hi Richard,

Apologies for dragging you in here.

How stable is this fastmap format?

Will it leave Experimental state in the near future?


Thanks,

Koen


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