[PATCH v4 0/2] mtd: spi: nor: force mtd name to "nor%d"

[Tom Rini]

On Thu, Sep 23, 2021 at 11:04:28AM +0200, Patrick DELAUNAY wrote:
> Hi,
> 
> On 9/23/21 3:32 AM, Marek Vasut wrote:
> > On 9/22/21 10:00 PM, Tom Rini wrote:
> > > On Wed, Sep 22, 2021 at 09:56:26PM +0200, Marek Vasut wrote:
> > > > On 9/22/21 9:46 PM, Tom Rini wrote:
> > > > > On Wed, Sep 22, 2021 at 09:24:24PM +0200, Marek Vasut wrote:
> > > > > 
> > > > > > I am talking about using nor%d in MTDIDS in U-Boot UBI
> > > > > > code to look up from
> > > > > > which device to attach UBI in U-Boot.
> > > > > 
> > > > > OK, so are we not able to pass in the correct name now?  Or
> > > > > just worried
> > > > > about old environment and new U-Boot?
> > > > 
> > > > Say you have the following in board config:
> > > > 
> > > > CONFIG_MTDIDS_DEFAULT="nor0=ff705000.spi.0"
> > > > CONFIG_MTDPARTS_DEFAULT="mtdparts=ff705000.spi.0:-(fs);"
> > > > 
> > > > Then run "=> ubi part fs", which will fail to find nor0, because
> > > > now that
> > > > nor0 is called something else. That is what this series tries to fix.
> > > 
> > > Yes, and what is nor0 now, and what happens if you use it?
> > 
> > Now it is "mt25ql02g", for all mt25ql02g on the board, so ... I cannot
> > even select the one SPI NOR I want to use, since they are not even
> > enumerated in any way, they are all the same. You might want to look at
> > get_mtd_device_nm() in drivers/mtd/mtdcore.c .
> 
> 
> To comple me use case, on EV1 board can boot from NOR / NAND / SPI-NAND
> 
> so mtdparts and mtdids are buidl dynamically with
> CONFIG_SYS_MTDPARTS_RUNTIME in
> 
> afraided board/st/common/stm32mp_mtdparts.c::board_mtdparts_default()
> 
> 
> I don't use MTDIDS_DEFAULT / MTDPARTS_DEFAULT.
> 
> 
> For example, when I force NOR / NAND presence, I create the MTD variables:
> 
> mtdids=nand0=nand0,nor0=nor0
> 
> mtdparts=mtdparts=nand0:2m(fsbl),2m(ssbl1),2m(ssbl2),-(UBI);nor0:256k(fsbl1),256k(fsbl2),2m(ssbl),512k(u-boot-env),-(nor_user)
> 
> 
> The command "mtdparts" is working in previous U-Boot releaseafraided
> 
> and it is not more working as the name of MTD device change
> 
> 
> Today, without my patch I have
> 
> STM32MP> mtd list
> SF: Detected mx66l51235l with page size 256 Bytes, erase size 64 KiB, total
> 64 MiB
> Could not find a valid device for nor0
> List of MTD devices:
> * nand0
>   - type: NAND flash
>   - block size: 0x40000 bytes
>   - min I/O: 0x1000 bytes
>   - OOB size: 224 bytes
>   - OOB available: 118 bytes
>   - ECC strength: 8 bits
>   - ECC step size: 512 bytes
>   - bitflip threshold: 6 bits
>   - 0x000000000000-0x000040000000 : "nand0"
>       - 0x000000000000-0x000000200000 : "fsbl"
>       - 0x000000200000-0x000000400000 : "ssbl1"
>       - 0x000000400000-0x000000600000 : "ssbl2"
>       - 0x000000600000-0x000040000000 : "UBI"
> * mx66l51235l
>   - device: mx66l51235l at 0
>   - parent: spi at 58003000
>   - driver: jedec_spi_nor
>   - path: /soc/spi at 58003000/mx66l51235l at 0
>   - type: NOR flash
>   - block size: 0x10000 bytes
>   - min I/O: 0x1 bytes
>   - 0x000000000000-0x000004000000 : "mx66l51235l"
> * mx66l51235l
>   - device: mx66l51235l at 1
>   - parent: spi at 58003000
>   - driver: jedec_spi_nor
>   - path: /soc/spi at 58003000/mx66l51235l at 1
>   - type: NOR flash
>   - block size: 0x10000 bytes
>   - min I/O: 0x1 bytes
>   - 0x000000000000-0x000004000000 : "mx66l51235l"
> 
> 
> 
> before my patch, Ihave always the error "Device nor0 not found!" on mtdparts
> command
> 
> => get_mtd_info
> 
> ==> get_mtd_device_nm("nor0")   build with MTD_DEV_TYPE(type)
> 
> ===> mtd_device_matches_name()
> 
>             and here "nor0" must be  mtd->name acoring the code
> 
> 
> or I miss something...
> 
> 
> I don't found any way to solve my issue only with "mtdids" variable.
> 
> so I restore the previous behavior as I expect the mtd name
> 
> modification can impact many other boards.
> 
> 
> A other solution can be change get_mtd_info(),
> 
> but I was also afraid of side effect.

Thanks for explaining more.  Marek, any ideas on how to resolve this
best, other than logic to restore some form of nor%d being created here?

-- 
Tom
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