Re: amlogic mmc_partitions support

[Andreas Fenkart <afenkart@gmail.com>]

Hi Neil,

Am Mo., 14. Jan. 2019 um 11:00 Uhr schrieb Neil Armstrong
<narmstrong@baylibre.com>:
>
>
> Basically, Amlogic uses the eMMC main partition as a MTD devices and uses a
> custom DT partition scheme to export named MTD partitions to user-space.

I've seen the dt section about partitions, but the partition table is
also stored on the emmc.
It's at an offset (36 MB) and uses a custom c struct.

#define     MAX_MMC_PART_NUM                32

struct partitions {
    /* identifier string */
    char name[MAX_PART_NAME_LEN];
    /* partition size, byte unit */
    uint64_t size;
    /* offset within the master space, byte unit */
    uint64_t offset;
    /* master flags to mask out for this partition */
    unsigned mask_flags;
};

struct mmc_partitions_fmt {
    char magic[4];
    unsigned char version[12];
    int part_num;
    int checksum;
    struct partitions partitions[MAX_MMC_PART_NUM];
};

I'm trying to create a prototype. Is this something that could be
mainlined then?

> > Anybody else that tries to support the existing amlogic partition
> > format, not the implementation, as is. I want to upgrade the kernel
> > via fw upgrade on existing installations, but not touch the u-boot nor
> > the formatting.
>
> Some people forward ported it, and is available on some git repos around the
> Khadas VIM support.

thanks,

/Andi

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