From mboxrd@z Thu Jan 1 00:00:00 1970 From: w.sang@pengutronix.de (Wolfram Sang) Date: Sat, 31 Dec 2011 16:43:38 +0100 Subject: [PATCH v2] MTD/GPMI bugfix : reset the BCH module when it is not MX23 In-Reply-To: <4EFE7236.10609@freescale.com> References: <1325233646-3343-1-git-send-email-b32955@freescale.com> <20111230143658.GA9141@pengutronix.de> <4EFE7236.10609@freescale.com> Message-ID: <20111231154338.GA27544@pengutronix.de> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, On Sat, Dec 31, 2011 at 10:23:50AM +0800, Huang Shijie wrote: > > On Fri, Dec 30, 2011 at 04:27:26PM +0800, Huang Shijie wrote: > >> In MX28, if we do not reset the BCH module. The BCH module may > >> becomes unstable when the board reboots for several thousands times. > > Do you have more details when and why this happens? What happens on MX23 then? > In one customer's 3G router which uses the MX28: > [0] NAND boot mode, mount the UBIFS in the NAND partition. > [1] We used the gpmi_reset_block(r->bch_regs, true) to init the BCH module. > [2] The board will automatically reboot again after it booted by NAND > boot mode. > [3] After reboot more then thousands times(cost nearly one day), the BCH > mode became UNSTABLE, > the data read out was not right, so the system could not mount the UBIFS. > > After we use gpmi_reset_block(r->bch_regs, false) to init the BCH > module, the bug never happens. Yes, I undestood that. I was curious _why_ this happens, for example, because of a bug in the rom-code or such. This would then lead to the question if this can be fixed by some other means. Because currently it looks like this to me: If you would do the above scenario of booting 10000 times on a MX23, then BCH could enter the same unstable state (can it?). Since we cannot reset BCH due to bug 2847, we have a serious problem, because NAND won't work until the next power-cycle? I am curious if my assumptions are true and we have a serious problem on the MX23. > Yes, this is the bug 2847 from the mx23's errata. OK, thanks. Kind regards, Wolfram -- Pengutronix e.K. | Wolfram Sang | Industrial Linux Solutions | http://www.pengutronix.de/ | -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 198 bytes Desc: Digital signature URL: