Re: [PATCH 1/2] mmc-utils: lsmmc.c: print_mmc_cid(): correct year/month parsing

[Shawn Lin <shawn.lin@rock-chips.com>]

在 2025/11/05 星期三 15:07, Peter Korsgaard 写道:
>>>>>> "Shawn" == Shawn Lin <shawn.lin@rock-chips.com> writes:
> 
> Hi,
> 
>   > From the JESD84-B51, section 7.2.7,
> 
>   > For e•MMC 4.41 and later devices, indicated by a value larger than 4 in
>   > EXT_CSD_REV [192], the 4-bit“y” field shall roll over after 2012, so
>   > that y=0 shall be used for 2013. See Table 77 for a list of valid y
>   > values for specific e•MMC versions.
> 
>   > So mdt_year + 1997 seems wrong, too.
> 
> That tweak is even not enough, E.G. I see the kernel does:
> 
>         if (card->ext_csd.rev >= 5) {
>                  /* Adjust production date as per JEDEC JESD84-B451 */
>                  if (card->cid.year < 2010)
>                          card->cid.year += 16;
> 
> 2009 + 16 = 2025, so what will happen in a few months?
> 

TBH, I don't know if there is any update from JEDEC. :)