2013/4/30 Scott Wood <scottw...@freescale.com>: > On 04/28/2013 10:28:14 PM, Kuo-Jung Su wrote: >> >> 2013/4/27 Scott Wood <scottw...@freescale.com>: >> >> > Shouldn't .eccpos depend on HWECC? >> > >> > >> >> Actually it means nothing here, the ECC function is designed to be some >> kind of >> a blackbox to users (i.e softwares), the actual position of ECC codes >> are not documented >> in the datasheet, I have to dig it out from RTL which I do not have >> permission to access. > > > Maybe get rid of .eccpos altogether, and supply your own (much simpler) > hwecc read/write_page functions -- similar to what fsl_elbc_nand, which also > has transparent (but not hidden) ECC, does? This would also let you get rid > of hwctl/calculate/correct. > >
Got it, thanks I'll check it later. >> > Is it really all in one step, regardless of page size? >> > >> >> Theoretical, NO. >> It uses R-S or BCH for Forwarding Error Correction, which is selected >> at RTL level. >> Which means it actually 522 bytes per step at RS and 528 bytes per step at >> BCH. >> >> However it's all blackbox to software, the FTNANDC021 simply supports only >> page read, so looks like everything is done at 1 step. > > > It would matter if you could detect correctable errors, but since you can't, > it doesn't. > Got it, thanks > -Scott -- Best wishes, Kuo-Jung Su _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
