Naga Sureshkumar Relli, On 26.10.2016 14:11, Naga Sureshkumar Relli wrote: > Hi Richard, > > -----Original Message----- > From: Richard Weinberger [mailto:[email protected]] > Sent: Wednesday, October 26, 2016 2:44 AM > To: Naga Sureshkumar Relli <[email protected]>; Christoph Hellwig > <[email protected]> > Cc: [email protected]; [email protected]; [email protected]; > [email protected]; [email protected]; Punnaiah Choudary Kalluri > <[email protected]>; [email protected]; > [email protected]; Boris Brezillon > <[email protected]> > Subject: Re: UBIFS LEB properties tree with odd addresses > > Naga Sureshkumar Relli, >> Even bytes i.e. 0, 2, 4,... are transmitted on Lower Data Bus >> Odd bytes i.e. 1, 3, 5,.. are transmitted on Upper Data Bus. > >> But these details are hidden from UBI? > > Yes, Our controller driver will take care of these byte striping. > >> So for temporary hack we did the following change In fs/ubifs/lpt.c In >> do_calc_lpt_geom(), added the following >> + if (c->pnode_sz % 2) >> + c->pnode_sz += 1; >> + if (c->ltab_sz % 2) >> + c->ltab_sz += 1; >> >> Please kindly suggest, I need your inputs, changing the pnode_sz and ltab_sz >> to even in lpt.c, will it impact on any others? > >> Hmm, the calculations in lpt.c use basic properties of the MTD (number of >> blocks, etc...). >> Can you please double check which property causes the failure and also >> verify whether the MTD driver provides correct properties. i.e. page sizes, >> block size, number of blocks, ... > > Yes, only pnode_sz and ltab_sz are odd values
Hm, these values depend only on basic MTD prperties AFAICT. > And MTD info, here are my logs > In Single Flash mode: > Mtd->erasesize = 64KiB > Mtd->size = 64MiB > Mtd->numeraseregions = 0 > Nor->pagesize = 256 > > In Dual parallel mode: > Mtd->erasesize = 128KiB > Mtd->size = 128MiB > Mtd->numeraseregions = 0 > Nor->pagesize = 512 How does UBI report them? Maybe you miss some bit and set incorrect MTD properties. A 128MiB MTD with 128KiB erase size is nothing special. Thanks, //richard
