Hi Scott, Thanks for your comments.
> -----Original Message----- > From: Scott Wood [mailto:o...@buserror.net] > Sent: 2016年4月7日 6:01 > To: Zhiqiang Hou <zhiqiang....@nxp.com>; linuxppc-dev@lists.ozlabs.org; > b...@kernel.crashing.org; pau...@samba.org; m...@ellerman.id.au > Cc: Mingkai Hu <mingkai...@nxp.com> > Subject: Re: [PATCH] powerpc/config: Disable the 4KiB erase granularity of SPI > flash > > On Wed, 2016-04-06 at 18:14 +0800, Zhiqiang Hou wrote: > > From: Hou Zhiqiang <zhiqiang....@nxp.com> > > > > Disable the subsector (4KiB) erase granularity to speed up the erase > > operation. > > > > Signed-off-by: Hou Zhiqiang <zhiqiang....@nxp.com> > > --- > > arch/powerpc/configs/85xx-hw.config | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/arch/powerpc/configs/85xx-hw.config > > b/arch/powerpc/configs/85xx -hw.config index 528ff0e..a0f4e70 100644 > > --- a/arch/powerpc/configs/85xx-hw.config > > +++ b/arch/powerpc/configs/85xx-hw.config > > @@ -77,6 +77,7 @@ CONFIG_MTD_PHYSMAP_OF=y > CONFIG_MTD_PHYSMAP=y > > CONFIG_MTD_PLATRAM=y CONFIG_MTD_SPI_NOR=y > > +# CONFIG_MTD_SPI_NOR_USE_4K_SECTORS is not set > > CONFIG_NETDEVICES=y > > CONFIG_NVRAM=y > > CONFIG_PATA_ALI=y > > Is there a reason specific to 85xx to have a different default than every > other > platform except lpc18xx? The description of MTD_SPI_NOR_USE_4K_SECTORS > acknowledges that erase speed is a tradeoff. Why is that concern more > compelling on 85xx than elsewhere? > I don't want to specify 85xx, but configs of fsl. I'm still confusing about so many configs. Will add other platforms if necessary. For this patch, it takes about 13 mins to erase 64MiB by subsector erase command (4KiB per time), but takes 2 mins by sector erase command(64KiB per time). It is conspicuous decrease. Why it uses the 4KiB granularity by default, what's the benefit? Thanks, Zhiqiang _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
