While UBI and UBIFS seem to work at first sight with MLC NAND, you will
most likely lose all your data upon a power-cut or due to read/write
disturb.
In order to protect users from bad surprises, refuse to attach to MLC
NAND.
Cc: sta...@vger.kernel.org
Signed-off-by: Richard Weinberger
---
drive
On Sat 2018-03-03 11:45:54, Richard Weinberger wrote:
> While UBI and UBIFS seem to work at first sight with MLC NAND, you will
> most likely lose all your data upon a power-cut or due to read/write
> disturb.
> In order to protect users from bad surprises, refuse to attach to MLC
> NAND.
>
> Cc:
On 03/07/2018 12:18 AM, Pavel Machek wrote:
> Now... Yes, handling flash is hard, MLC NAND is worst of the
> bunch. But...
>
MLC is not just more flimsy than SLC NAND.
The real problem is that on MLC NAND, pages come in pairs.
Multiple voltage levels inside a single, physical memory cell are use
Pavel,
Am Mittwoch, 7. März 2018, 00:18:05 CET schrieb Pavel Machek:
> On Sat 2018-03-03 11:45:54, Richard Weinberger wrote:
> > While UBI and UBIFS seem to work at first sight with MLC NAND, you will
> > most likely lose all your data upon a power-cut or due to read/write
> > disturb.
> > In orde
On Wed, 2018-03-07 at 09:01 +0100, Richard Weinberger wrote:
> Pavel,
>
> Am Mittwoch, 7. März 2018, 00:18:05 CET schrieb Pavel Machek:
> > On Sat 2018-03-03 11:45:54, Richard Weinberger wrote:
> > > While UBI and UBIFS seem to work at first sight with MLC NAND,
> > > you will
> > > most likely lo
On Wed 2018-03-07 09:01:16, Richard Weinberger wrote:
> Pavel,
>
> Am Mittwoch, 7. März 2018, 00:18:05 CET schrieb Pavel Machek:
> > On Sat 2018-03-03 11:45:54, Richard Weinberger wrote:
> > > While UBI and UBIFS seem to work at first sight with MLC NAND, you will
> > > most likely lose all your d
Hi Pavel,
On Wed, Mar 7, 2018 at 1:43 PM, Pavel Machek wrote:
> On Wed 2018-03-07 09:01:16, Richard Weinberger wrote:
>> Pavel,
>>
>> Am Mittwoch, 7. März 2018, 00:18:05 CET schrieb Pavel Machek:
>> > On Sat 2018-03-03 11:45:54, Richard Weinberger wrote:
>> > > While UBI and UBIFS seem to work at
On Wed, 2018-03-07 at 14:08 -0800, Steve deRosier wrote:
>
> To clarify one thing: the reason for this is MLC has actually never
> been supported, nor worked properly. The fact that it kinda worked was
> incidental and the cause of major problems for people due to that not
> being clear. This pa
On Wed 2018-03-07 22:11:13, David Woodhouse wrote:
>
>
> On Wed, 2018-03-07 at 14:08 -0800, Steve deRosier wrote:
> >
> > To clarify one thing: the reason for this is MLC has actually never
> > been supported, nor worked properly. The fact that it kinda worked was
> > incidental and the cause of
Hi Pavel,
On Wed, 7 Mar 2018 23:17:33 +0100
Pavel Machek wrote:
> On Wed 2018-03-07 22:11:13, David Woodhouse wrote:
> >
> >
> > On Wed, 2018-03-07 at 14:08 -0800, Steve deRosier wrote:
> > >
> > > To clarify one thing: the reason for this is MLC has actually never
> > > been supported, nor
On Wed, 7 Mar 2018 22:43:42 +0100
Pavel Machek wrote:
> On Wed 2018-03-07 09:01:16, Richard Weinberger wrote:
> > Pavel,
> >
> > Am Mittwoch, 7. März 2018, 00:18:05 CET schrieb Pavel Machek:
> > > On Sat 2018-03-03 11:45:54, Richard Weinberger wrote:
> > > > While UBI and UBIFS seem to work
Hi Boris,
On Wed, Mar 07, 2018 at 11:30:57PM +0100, Boris Brezillon wrote:
> I have one simple question: did you ever play with MLC NANDs or are you
> just trolling? If you had, like Richard and I did when working on MLC
> support, I'm pretty sure you wouldn't play this "don't backport to
> stable
On Sat, Mar 3, 2018 at 11:45 AM, Richard Weinberger wrote:
> While UBI and UBIFS seem to work at first sight with MLC NAND, you will
> most likely lose all your data upon a power-cut or due to read/write
> disturb.
>
> In order to protect users from bad surprises, refuse to attach to MLC
> NAND.
Linus,
Am Donnerstag, 8. März 2018, 14:42:16 CET schrieb Linus Walleij:
> On Sat, Mar 3, 2018 at 11:45 AM, Richard Weinberger wrote:
> > While UBI and UBIFS seem to work at first sight with MLC NAND, you will
> > most likely lose all your data upon a power-cut or due to read/write
> > disturb.
>
On Thu, 2018-03-08 at 15:43 +0100, Richard Weinberger wrote:
> As stated by David Woodhouse, it was a huge mistake by UBI to not
> reject MLC
> NAND from the very beginning.
Correction: when we were developing UBI/UBIFS and upstreamed them, MLC
was widely used yet we did not really know about it.
Artem,
Am Donnerstag, 8. März 2018, 16:01:15 CET schrieb Artem Bityutskiy:
> On Thu, 2018-03-08 at 15:43 +0100, Richard Weinberger wrote:
> > As stated by David Woodhouse, it was a huge mistake by UBI to not
> > reject MLC
> > NAND from the very beginning.
>
> Correction: when we were developing
On Thu, 2018-03-08 at 16:28 +0100, Richard Weinberger wrote:
> You mean *not* widely used?
Yes, indeed, thanks for correction. MLC just wasn't there yet when
UBI/UBIFS were upstreamed.
On Sat, 3 Mar 2018 11:45:54 +0100
Richard Weinberger wrote:
> While UBI and UBIFS seem to work at first sight with MLC NAND, you will
> most likely lose all your data upon a power-cut or due to read/write
> disturb.
> In order to protect users from bad surprises, refuse to attach to MLC
> NAND.
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