[U-Boot] [PATCHv3] mtd: sf: Add CONFIG_SPI_N25Q256A_RESET for software-reset

[Jagan Teki]

On 11 May 2015 at 14:20, Pavel Machek <pavel at denx.de> wrote:
> On Mon 2015-05-11 14:14:32, Jagan Teki wrote:
>> On 11 May 2015 at 14:09, Pavel Machek <pavel at denx.de> wrote:
>> > On Mon 2015-05-11 14:03:06, Jagan Teki wrote:
>> >> On 11 May 2015 at 13:59, Pavel Machek <pavel at denx.de> wrote:
>> >> > On Mon 2015-05-11 13:35:04, Jagan Teki wrote:
>> >> >> On 11 May 2015 at 13:18, Marek Vasut <marex at denx.de> wrote:
>> >> >> > On Sunday, May 10, 2015 at 07:53:46 PM, Pavel Machek wrote:
>> >> >> >
>> >> >> > [...]
>> >> >> >
>> >> >> >> > As per my early comments on this thread, I'm not happy with this approach
>> >> >> >> > of being added flash specific in generic code by simply added like this.
>> >> >> >> >
>> >> >> >> > I encounter similar issue before and I simply reverted [1]
>> >> >> >> > http://git.denx.de/?p=u-boot.git;a=commit;h=122d805fd4bd478bb83536348291d
>> >> >> >> > 34ae648364b
>> >> >> >> >
>> >> >> >> > Please think in a different perceptive like adding any flags to specific
>> >> >> >> > vendor with specific part, but that also require proper tested.
>> >> >> >>
>> >> >> >> Ok, could you explain how you'd like to have it solved? Should we just
>> >> >> >> call spi_flash_cmd() from socfpga-specific code?
>> >> >> >>
>> >> >> >> But I'm pretty sure similar issue will be encountered on different
>> >> >> >> boards, so it would be good to have it in shared place. Do you want me
>> >> >> >> to create sf_probe_micron and move it there?
>> >> >> >
>> >> >> > I'd just add a flag into the SPI NOR table and in the code, I'd check
>> >> >> > if the flag is set and if so, trigger the Micron-specific code. That
>> >> >> > ought to be simple and it doesn't introduce any new config options.
>> >> >>
>> >> >> Ok, solutions - what about Linux same issue or this requirement should be only
>> >> >> for u-boot or bootloaders?
>> >> >
>> >> > Linux probably has same issue.
>> >>
>> >> Please check the same.
>> >>
>> >> >
>> >> > Do you like Marek's "add a flag to table" proposal?
>> >>
>> >> Please send the patch to both the ML's.
>> >
>> > Which mailing lists do you mean?
>>
>> I meant to say if something is not working with Linux as well, send the same
>> patch to both U-Boot and Linux.
>
> Linux already handles it, see drivers/mtd/spi-nor/spi-nor.c, functions
> spi_nor_scan and set_4byte.

Seems like nothing much doing in micron side
        switch (JEDEC_MFR(info)) {
        case CFI_MFR_ST: /* Micron, actually */
                /* Some Micron need WREN command; all will accept it */
                need_wren = true;

thanks!
-- 
Jagan Teki,
Openedev.