Updating raw NAND PEB

[Sheikh Bakir]

Hi All,

I need to update a raw NAND partition. The raw nand partition fits into single PEB, due to bad block management I reserved extra PEB for this specific partition. Now I need to identify and check if a particular PEB is good/bad before installing image in run time.

I am new to swupdate and after reading the documentation, I am thinking to do this way.

• Write embedded-script lua script to find the offset of first good PEB from the reserved 4 PEB.
• Add offset attribute to the image table

Example:

images =
    (
        {
            filename = "<image_name>";
            device = "/dev/block/platform/<partition_name>";
            type = "raw";
            installed-directly = True
            hook = "set_offset"
        },
        ..
        ..
        ..
    )
function set_offset(image)
    //set offset="query the good PEB offset from the device"
end

Does this sound right or I am missing something from the doc to handle this in better way. 

Thanks you! and appropriate for any help. 

[Stefano Babic]

Hi Sheikh,

On 31.07.24 22:38, Sheikh Bakir wrote:
> Hi All,
>
> I need to update a raw NAND partition. The raw nand partition fits into
> single PEB, due to bad block management I reserved extra PEB for this
> specific partition. Now I need to identify and check if a particular PEB
> is good/bad before installing image in run time.
>
> I am new to swupdate and after reading the documentation, I am thinking
> to do this way.
>

> * Write embedded-script lua script to find the offset of first good

> PEB from the reserved 4 PEB.

> * Add *offset* attribute to the image table
>
> Example:
> /images =

>     (
>         {
>             filename = "<image_name>";
>             device = "/dev/block/platform/<partition_name>";
>             type = "raw";

Wrong.

>             installed-directly = True
>             hook = "set_offset"
>         },
>         ..
>         ..
>         ..
>     )

> function //set_offset//(image)

>     //set offset="query the good PEB offset from the device"

> end/
> /
> /
> Does this sound right

No.

SWUpdate is able to manage bad blocks. You just need to pass the MTD
device where the artifact should be installed. There is a specific
handler "flash" to be used, and this will skip bad blocks. No need to
work with offsets.

Best regards,
Stefano Babic

[Sheikh Bakir]

Thank you very much Stefano, this is exactly what I was looking for. I appreciate your quick response. 

Best regards,

- Sheikh 

[Sheikh Bakir]

Hi Stefano,

Actually I need the offset value to generate some headers and set some Boot ROM register - so seems like using only flash handler won't work for this. In that case can I explicitly set the offset  using embedded-lua script with type=flash? Thanks 

BR,

- Sheikh