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From:   =?UTF-8?B?w4FsdmFybyBGZXJuw6FuZGV6IFJvamFz?= <noltari@gmail.com>
Date:   Tue, 16 May 2023 21:02:13 +0200
Message-ID: <CAKR-sGer0r0FxyOQQu7TxT0d2D981_1fQWxa_XghfyWKWSJVfQ@mail.gmail.com>
Subject: Re: [PATCH 1/2] dt-bindings: mtd: nand: Macronix: document new binding
To:     Florian Fainelli <f.fainelli@gmail.com>
Cc:     liao jaime <jaimeliao.tw@gmail.com>,
        "William (Zhenghao) Zhang" <william.zhang@broadcom.com>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Richard Weinberger <richard@nod.at>,
        Vignesh Raghavendra <vigneshr@ti.com>, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, linux-mtd@lists.infradead.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
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Precedence: bulk

Sure,

Here you go:
[    0.000000] Linux version 5.15.111 (noltari@atlantis)
(mips-openwrt-linux-musl-gcc (OpenWrt GCC 12.3.0 r0+22899-466be0612a)
12.3.0, GNU ld (GNU Binutils) 2.40.0) #0 SMP Tue May 16 14:33:20 2023
[    0.000000] CPU0 revision is: 0002a080 (Broadcom BMIPS4350)
[    0.000000] MIPS: machine is Sercomm H500-s vfes
[    0.000000] 128MB of RAM installed
[    0.000000] earlycon: bcm63xx_uart0 at MMIO 0x10000180 (options '115200n=
8')
[    0.000000] printk: bootconsole [bcm63xx_uart0] enabled
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Reserving 0KB of memory at 4194303KB for kdump
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 16 byt=
es.
[    0.000000] Primary data cache 32kB, 2-way, VIPT, cache aliases,
linesize 16 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007fff=
fff]
[    0.000000] percpu: Embedded 11 pages/cpu s13328 r8192 d23536 u45056
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32480
[    0.000000] Kernel command line: earlycon
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536
bytes, linear)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768
bytes, linear)
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 108656K/131072K available (6902K kernel code,
613K rwdata, 1404K rodata, 11872K init, 215K bss, 22416K reserved, 0K
cma-reserved)
[    0.000000] SLUB: HWalign=3D64, Order=3D0-3, MinObjects=3D0, CPUs=3D2, N=
odes=3D1
[    0.000000] rcu: Hierarchical RCU implementation.
[    0.000000]  Tracing variant of Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay
is 10 jiffies.
[    0.000000] NR_IRQS: 256
[    0.000000] irq_bcm6345_l1: registered BCM6345 L1 intc (IRQs: 128)
[    0.000000] irq_bcm6345_l1:   CPU0 (irq =3D 2)
[    0.000000] irq_bcm6345_l1:   CPU1 (irq =3D 3)
[    0.000000] brcm,bcm63268 detected @ 400 MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles:
0xffffffff, max_idle_ns: 9556302233 ns
[    0.000002] sched_clock: 32 bits at 200MHz, resolution 5ns, wraps
every 10737418237ns
[    0.008292] Calibrating delay loop... 398.13 BogoMIPS (lpj=3D1990656)
[    0.074683] pid_max: default: 32768 minimum: 301
[    0.081788] Mount-cache hash table entries: 1024 (order: 0, 4096
bytes, linear)
[    0.089319] Mountpoint-cache hash table entries: 1024 (order: 0,
4096 bytes, linear)
[    0.106094] rcu: Hierarchical SRCU implementation.
[    0.112665] smp: Bringing up secondary CPUs ...
[    0.119348] SMP: Booting CPU1...
[    8.330979] Primary instruction cache 64kB, VIPT, 4-way, linesize 16 byt=
es.
[    8.331017] Primary data cache 32kB, 2-way, VIPT, cache aliases,
linesize 16 bytes
[    8.331294] CPU1 revision is: 0002a080 (Broadcom BMIPS4350)
[    0.182819] Synchronize counters for CPU 1:
[    0.203500] SMP: CPU1 is running
[    0.203512] done.
[    0.213401] smp: Brought up 1 node, 2 CPUs
[    0.228870] clocksource: jiffies: mask: 0xffffffff max_cycles:
0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.239058] futex hash table entries: 512 (order: 3, 32768 bytes, linear=
)
[    0.246439] pinctrl core: initialized pinctrl subsystem
[    0.254917] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[    0.312700] clocksource: Switched to clocksource MIPS
[    0.321061] NET: Registered PF_INET protocol family
[    0.326879] IP idents hash table entries: 2048 (order: 2, 16384
bytes, linear)
[    0.335972] tcp_listen_portaddr_hash hash table entries: 512
(order: 0, 6144 bytes, linear)
[    0.344721] Table-perturb hash table entries: 65536 (order: 6,
262144 bytes, linear)
[    0.352721] TCP established hash table entries: 1024 (order: 0,
4096 bytes, linear)
[    0.360622] TCP bind hash table entries: 1024 (order: 1, 8192 bytes, lin=
ear)
[    0.368005] TCP: Hash tables configured (established 1024 bind 1024)
[    0.375074] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[    0.381862] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, line=
ar)
[    0.389762] NET: Registered PF_UNIX/PF_LOCAL protocol family
[    0.395748] PCI: CLS 0 bytes, default 16
[    0.403410] workingset: timestamp_bits=3D14 max_order=3D15 bucket_order=
=3D1
[    0.426490] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.432492] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME)
(CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.459472] bcm63xx-power-controller 1000184c.power-controller:
registered 14 power domains
[    0.470267] 10000180.serial: ttyS0 at MMIO 0x10000180 (irq =3D 8,
base_baud =3D 1562500) is a bcm63xx_uart
[    0.479996] printk: console [ttyS0] enabled
[    0.479996] printk: console [ttyS0] enabled
[    0.488651] printk: bootconsole [bcm63xx_uart0] disabled
[    0.488651] printk: bootconsole [bcm63xx_uart0] disabled
[    0.533435] bcm2835-rng 10002880.rng: hwrng registered
[    0.606025] bcm6368_nand 10000200.nand: there is not valid maps for
state default
[    0.633977] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xf1
[    0.640506] nand: Macronix MX30LF1G18AC
[    0.644551] nand: 128 MiB, SLC, erase size: 128 KiB, page size:
2048, OOB size: 64
[    0.652359] bcm6368_nand 10000200.nand: detected 128MiB total,
128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
[    0.703373] Bad block table not found for chip 0
[    0.732040] Bad block table not found for chip 0
[    0.736842] Scanning device for bad blocks
[    0.832678] CPU 0 Unable to handle kernel paging request at virtual
address 00000014, epc =3D=3D 8009b300, ra =3D=3D 806cc650
[    0.843628] Oops[#1]:
[    0.845958] CPU: 0 PID: 88 Comm: hwrng Not tainted 5.15.111 #0
[    0.851959] $ 0   : 00000000 00000001 00000008 00000000
[    0.857358] $ 4   : 81808464 00000064 00000000 00000001
[    0.862753] $ 8   : 81810000 00001ff0 00001c00 815b8880
[    0.868146] $12   : 0000b79d 00000000 00000000 00009bb

Please, tell me if you want me to add any debugging to the log.

Best regards,
=C3=81lvaro.

El mar, 16 may 2023 a las 20:58, Florian Fainelli
(<f.fainelli@gmail.com>) escribi=C3=B3:
>
> +William,
>
> On 5/16/23 11:55, =C3=81lvaro Fern=C3=A1ndez Rojas wrote:
> > Hi Jaime,
> >
> > I've reproduced the issue on a Comtrend VR-3032u (MX30LF1G08AA). After
> > forcing it to check block protection (it's not supported on that
> > device), the NAND controller stops reading/writing anything.
> >
> > @Florian is it possible that low level ops (GET_FEATURES/SET_FEATURES)
> > aren't supported on BCM63268 NAND controllers and this is causing the
> > issue?
>
> Yes, this looks like what we have seen as well even with newer NAND
> controllers actually. Would it be possible to obtain a full log from
> either of you?
>
> William, is this something you have seen before as well?
>
> >
> > Best regards,
> > =C3=81lvaro.
> >
> > El mi=C3=A9, 26 abr 2023 a las 9:24, liao jaime (<jaimeliao.tw@gmail.co=
m>) escribi=C3=B3:
> >>
> >> Hi =C3=81lvaro
> >>
> >> In nand_scan_tail(), each manufacturer init function call will be exec=
ute.
> >> In macronix_nand_init(), block protect will be execute after flash det=
ect.
> >> I have validate MX30LF1G18AC in Linux kernel v5.15.
> >> I didn't got situation "device hangs"  on my side.
> >> BP is to prevent incorrect operations.
> >> Please check the controller settings for tracing this issue.
> >>
> >> Thanks
> >> Jaime
> >>
> >>>
> >>> Hello YouChing and Jaime,
> >>>
> >>> I still didn't get any feedback from you (or Macronix) on this issue.
> >>> Did you have time to look into it?
> >>>
> >>> Thanks,
> >>> =C3=81lvaro.
> >>>
> >>> El vie, 24 mar 2023 a las 18:04, =C3=81lvaro Fern=C3=A1ndez Rojas
> >>> (<noltari@gmail.com>) escribi=C3=B3:
> >>>>
> >>>> Hi Miqu=C3=A8l,
> >>>>
> >>>> 2023-03-24 15:36 GMT+01:00, Miquel Raynal <miquel.raynal@bootlin.com=
>:
> >>>>> Hi =C3=81lvaro,
> >>>>>
> >>>>> + YouChing and Jaime from Macronix
> >>>>> TLDR for them: there is a misbehavior since Mason added block
> >>>>> protection support. Just checking if the blocks are protected seems=
 to
> >>>>> misconfigure the chip entirely, see below. Any hints?
> >>>>
> >>>> Could it be that the NAND is stuck expecting a read 0x00 command whi=
ch
> >>>> isn=E2=80=99t sent after getting the features?
> >>>>
> >>>>>
> >>>>> noltari@gmail.com wrote on Fri, 24 Mar 2023 15:15:47 +0100:
> >>>>>
> >>>>>> Hi Miqu=C3=A8l,
> >>>>>>
> >>>>>> 2023-03-24 14:45 GMT+01:00, Miquel Raynal <miquel.raynal@bootlin.c=
om>:
> >>>>>>> Hi =C3=81lvaro,
> >>>>>>>
> >>>>>>> noltari@gmail.com wrote on Fri, 24 Mar 2023 12:21:11 +0100:
> >>>>>>>
> >>>>>>>> El vie, 24 mar 2023 a las 11:49, Miquel Raynal
> >>>>>>>> (<miquel.raynal@bootlin.com>) escribi=C3=B3:
> >>>>>>>>>
> >>>>>>>>> Hi =C3=81lvaro,
> >>>>>>>>>
> >>>>>>>>> noltari@gmail.com wrote on Fri, 24 Mar 2023 11:31:17 +0100:
> >>>>>>>>>
> >>>>>>>>>> Hi Miqu=C3=A8l,
> >>>>>>>>>>
> >>>>>>>>>> El vie, 24 mar 2023 a las 10:40, Miquel Raynal
> >>>>>>>>>> (<miquel.raynal@bootlin.com>) escribi=C3=B3:
> >>>>>>>>>>>
> >>>>>>>>>>> Hi =C3=81lvaro,
> >>>>>>>>>>>
> >>>>>>>>>>> noltari@gmail.com wrote on Thu, 23 Mar 2023 13:45:09 +0100:
> >>>>>>>>>>>
> >>>>>>>>>>>> Add new "mxic,disable-block-protection" binding documentatio=
n.
> >>>>>>>>>>>> This binding allows disabling block protection support for
> >>>>>>>>>>>> those
> >>>>>>>>>>>> devices not
> >>>>>>>>>>>> supporting it.
> >>>>>>>>>>>>
> >>>>>>>>>>>> Signed-off-by: =C3=81lvaro Fern=C3=A1ndez Rojas <noltari@gma=
il.com>
> >>>>>>>>>>>> ---
> >>>>>>>>>>>>   Documentation/devicetree/bindings/mtd/nand-macronix.txt | =
3
> >>>>>>>>>>>> +++
> >>>>>>>>>>>>   1 file changed, 3 insertions(+)
> >>>>>>>>>>>>
> >>>>>>>>>>>> diff --git
> >>>>>>>>>>>> a/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> >>>>>>>>>>>> b/Documentation/devicetree/bindings/mtd/nand-macronix.txt
> >>>>>>>>>>>> index ffab28a2c4d1..03f65ca32cd3 100644
> >>>>>>>>>>>> --- a/Documentation/devicetree/bindings/mtd/nand-macronix.tx=
t
> >>>>>>>>>>>> +++ b/Documentation/devicetree/bindings/mtd/nand-macronix.tx=
t
> >>>>>>>>>>>> @@ -16,6 +16,9 @@ in children nodes.
> >>>>>>>>>>>>   Required NAND chip properties in children mode:
> >>>>>>>>>>>>   - randomizer enable: should be "mxic,enable-randomizer-otp=
"
> >>>>>>>>>>>>
> >>>>>>>>>>>> +Optional NAND chip properties in children mode:
> >>>>>>>>>>>> +- block protection disable: should be
> >>>>>>>>>>>> "mxic,disable-block-protection"
> >>>>>>>>>>>> +
> >>>>>>>>>>>
> >>>>>>>>>>> Besides the fact that nowadays we prefer to see binding
> >>>>>>>>>>> conversions
> >>>>>>>>>>> to
> >>>>>>>>>>> yaml before adding anything, I don't think this will fly.
> >>>>>>>>>>>
> >>>>>>>>>>> I'm not sure exactly what "disable block protection" means, w=
e
> >>>>>>>>>>> already have similar properties like "lock" and
> >>>>>>>>>>> "secure-regions",
> >>>>>>>>>>> not
> >>>>>>>>>>> sure they will fit but I think it's worth checking.
> >>>>>>>>>>
> >>>>>>>>>> As explained in 2/2, commit 03a539c7a118 introduced a regressi=
on
> >>>>>>>>>> on
> >>>>>>>>>> Sercomm H500-s (BCM63268) OpenWrt devices with Macronix
> >>>>>>>>>> MX30LF1G18AC
> >>>>>>>>>> which hangs the device.
> >>>>>>>>>>
> >>>>>>>>>> This is the log with block protection disabled:
> >>>>>>>>>> [    0.495831] bcm6368_nand 10000200.nand: there is not valid =
maps
> >>>>>>>>>> for
> >>>>>>>>>> state default
> >>>>>>>>>> [    0.504995] nand: device found, Manufacturer ID: 0xc2, Chip=
 ID:
> >>>>>>>>>> 0xf1
> >>>>>>>>>> [    0.511526] nand: Macronix MX30LF1G18AC
> >>>>>>>>>> [    0.515586] nand: 128 MiB, SLC, erase size: 128 KiB, page s=
ize:
> >>>>>>>>>> 2048, OOB size: 64
> >>>>>>>>>> [    0.523516] bcm6368_nand 10000200.nand: detected 128MiB tot=
al,
> >>>>>>>>>> 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> >>>>>>>>>> [    0.535912] Bad block table found at page 65472, version 0x=
01
> >>>>>>>>>> [    0.544268] Bad block table found at page 65408, version 0x=
01
> >>>>>>>>>> [    0.954329] 9 fixed-partitions partitions found on MTD devi=
ce
> >>>>>>>>>> brcmnand.0
> >>>>>>>>>> ...
> >>>>>>>>>>
> >>>>>>>>>> This is the log with block protection enabled:
> >>>>>>>>>> [    0.495095] bcm6368_nand 10000200.nand: there is not valid =
maps
> >>>>>>>>>> for
> >>>>>>>>>> state default
> >>>>>>>>>> [    0.504249] nand: device found, Manufacturer ID: 0xc2, Chip=
 ID:
> >>>>>>>>>> 0xf1
> >>>>>>>>>> [    0.510772] nand: Macronix MX30LF1G18AC
> >>>>>>>>>> [    0.514874] nand: 128 MiB, SLC, erase size: 128 KiB, page s=
ize:
> >>>>>>>>>> 2048, OOB size: 64
> >>>>>>>>>> [    0.522780] bcm6368_nand 10000200.nand: detected 128MiB tot=
al,
> >>>>>>>>>> 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> >>>>>>>>>> [    0.539687] Bad block table not found for chip 0
> >>>>>>>>>> [    0.550153] Bad block table not found for chip 0
> >>>>>>>>>> [    0.555069] Scanning device for bad blocks
> >>>>>>>>>> [    0.601213] CPU 1 Unable to handle kernel paging request at
> >>>>>>>>>> virtual
> >>>>>>>>>> address 10277f00, epc =3D=3D 8039ce70, ra =3D=3D 8016ad50
> >>>>>>>>>> *** Device hangs ***
> >>>>>>>>>>
> >>>>>>>>>> Enabling macronix_nand_block_protection_support() makes the de=
vice
> >>>>>>>>>> unable to detect the bad block table and hangs it when trying =
to
> >>>>>>>>>> scan
> >>>>>>>>>> for bad blocks.
> >>>>>>>>>
> >>>>>>>>> Please trace nand_macronix.c and look:
> >>>>>>>>> - are the get_features and set_features really supported by the
> >>>>>>>>>    controller driver?
> >>>>>>>>
> >>>>>>>> This is what I could find by debugging:
> >>>>>>>> [    0.494993] bcm6368_nand 10000200.nand: there is not valid ma=
ps for
> >>>>>>>> state default
> >>>>>>>> [    0.505375] nand: device found, Manufacturer ID: 0xc2, Chip I=
D:
> >>>>>>>> 0xf1
> >>>>>>>> [    0.512077] nand: Macronix MX30LF1G18AC
> >>>>>>>> [    0.515994] nand: 128 MiB, SLC, erase size: 128 KiB, page siz=
e:
> >>>>>>>> 2048, OOB size: 64
> >>>>>>>> [    0.523928] bcm6368_nand 10000200.nand: detected 128MiB total=
,
> >>>>>>>> 128KiB blocks, 2KiB pages, 16B OOB, 8-bit, BCH-4
> >>>>>>>> [    0.534415] bcm6368_nand 10000200.nand: ll_op cmd 0xa00ee
> >>>>>>>> [    0.539988] bcm6368_nand 10000200.nand: ll_op cmd 0x600a0
> >>>>>>>> [    0.545659] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> >>>>>>>> [    0.551214] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES=
 =3D
> >>>>>>>> 0x00
> >>>>>>>> [    0.557843] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> >>>>>>>> [    0.563475] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES=
 =3D
> >>>>>>>> 0x00
> >>>>>>>> [    0.569998] bcm6368_nand 10000200.nand: ll_op cmd 0x10000
> >>>>>>>> [    0.575653] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES=
 =3D
> >>>>>>>> 0x00
> >>>>>>>> [    0.582246] bcm6368_nand 10000200.nand: ll_op cmd 0x80010000
> >>>>>>>> [    0.588067] bcm6368_nand 10000200.nand: NAND_CMD_GET_FEATURES=
 =3D
> >>>>>>>> 0x00
> >>>>>>>> [    0.594657] nand: nand_get_features: addr=3Da0 subfeature_par=
am=3D[00
> >>>>>>>> 00 00 00] -> 0
> >>>>>>>> [    0.602341] macronix_nand_block_protection_support:
> >>>>>>>> ONFI_FEATURE_ADDR_MXIC_PROTECTION=3D0
> >>>>>>>> [    0.610548] macronix_nand_block_protection_support: !=3D
> >>>>>>>> MXIC_BLOCK_PROTECTION_ALL_LOCK
> >>>>>>>> [    0.624760] Bad block table not found for chip 0
> >>>>>>>> [    0.635542] Bad block table not found for chip 0
> >>>>>>>> [    0.640270] Scanning device for bad blocks
> >>>>>>>>
> >>>>>>>> I don't know how to tell if get_features / set_features is reall=
y
> >>>>>>>> supported...
> >>>>>>>
> >>>>>>> Looks like your driver does not support exec_op but the core prov=
ides a
> >>>>>>> get/set_feature implementation.
> >>>>>>
> >>>>>> According to Florian, low level should be supported on brcmnand
> >>>>>> controllers >=3D 4.0
> >>>>>> Also:
> >>>>>> https://github.com/nomis/bcm963xx_4.12L.06B_consumer/blob/e2f23ddb=
b20bf75689372b6e6a5a0dc613f6e313/shared/opensource/include/bcm963xx/63268_m=
ap_part.h#L1597
> >>>>>
> >>>>> Just to be sure, you're using a mainline controller driver, not thi=
s
> >>>>> one?
> >>>>
> >>>> Yes, this was just to prove that the HW I=E2=80=99m using has get/se=
t features support.
> >>>> I=E2=80=99m using OpenWrt, so it=E2=80=99s linux v5.15 driver.
> >>>>
> >>>>>
> >>>>>>>
> >>>>>>>>
> >>>>>>>>> - what is the state of the locking configuration in the chip wh=
en
> >>>>>>>>> you
> >>>>>>>>>    boot?
> >>>>>>>>
> >>>>>>>> Unlocked, I guess...
> >>>>>>>> How can I check that?
> >>>>>>>
> >>>>>>> It's in your dump, the chip returns 0, meaning it's all unlocked,
> >>>>>>> apparently.
> >>>>>>
> >>>>>> Well, I can read/write the device if block protection isn=E2=80=99=
t disabled,
> >>>>>> so I guess we can confirm it=E2=80=99s unlocked=E2=80=A6
> >>>>>>
> >>>>>>>
> >>>>>>>>> - is there anything that locks the device by calling mxic_nand_=
lock()
> >>>>>>>>> ?
> >>>>>>>
> >>>>>>> So nobody locks the device I guess? Did you add traces there?
> >>>>>>
> >>>>>> It doesn=E2=80=99t get to the point that it enabled the lock/unloc=
k functions
> >>>>>> since it fails when checking if feature is 0x38, so there=E2=80=99=
s no point
> >>>>>> in adding those traces=E2=80=A6
> >>>>>
> >>>>> Right, it returns before setting these I guess.
> >>>>>
> >>>>>>
> >>>>>>>
> >>>>>>>>> - finding no bbt is one thing, hanging is another, where is it
> >>>>>>>>> hanging
> >>>>>>>>>    exactly? (offset in nand/ and line in the code)
> >>>>>>>>
> >>>>>>>> I've got no idea...
> >>>>>>>
> >>>>>>> You can use ftrace or just add printks a bit everywhere and try t=
o get
> >>>>>>> closer and closer.
> >>>>>>
> >>>>>> I think that after trying to get the feature it just start reading
> >>>>>> nonsense from the NAND and at some point it hangs due to that garb=
age=E2=80=A6
> >>>>>
> >>>>> It should refuse to mount the device somehow, but in no case the ke=
rnel
> >>>>> should hang.
> >>>>
> >>>> Yes, I think that this is a side effect (maybe a different bug somew=
here else).
> >>>>
> >>>>>
> >>>>>> Is it posible that the NAND starts behaving like this after gettin=
g
> >>>>>> the feature due to some specific config of my device?
> >>>>>>
> >>>>>>>
> >>>>>>> I looked at the patch, I don't see anything strange. Besides, I h=
ave a
> >>>>>>> close enough datasheet and I don't see what could confuse the dev=
ice.
> >>>>>>>
> >>>>>>> Are you really sure this patch is the problem? Is the WP pin wire=
d on
> >>>>>>> your design?
> >>>>>>
> >>>>>> There=E2=80=99s no WP pin in brcmnand controllers < 7.0
> >>>>>
> >>>>> What about the chip?
> >>>>
> >>>> Maybe it has a GPIO controlling that, but I don=E2=80=99t have that =
info=E2=80=A6
> >>>>
> >>>>>
> >>>>> Thanks,
> >>>>> Miqu=C3=A8l
> >>>>>
>
> --
> Florian
>