Re: [PATCH RFT 0/2/2] mtd: hyperbus: add Renesas RPC-IF driver

[Dirk Behme <dirk.behme@xxxxxxxxx>]

Hi Sergei,

On 07.02.20 20:09, Sergei Shtylyov wrote:
> Hello!
>
> On 02/07/2020 03:59 PM, Behme Dirk (CM/ESO2) wrote:
>
> > > Add the HyperFLash driver for the Renesas RPC-IF.  It's the "front end"
> > > driver using the "back end" APIs in the main driver to talk to the real
> > > hardware.
> > >
> > > Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
> [...]
> > > Index: linux/drivers/mtd/hyperbus/rpc-if.c
> > > ===================================================================
> > > --- /dev/null
> > > +++ linux/drivers/mtd/hyperbus/rpc-if.c
> > > @@ -0,0 +1,162 @@
> [...]
> > > +static u16 rpcif_hb_read16(struct hyperbus_device *hbdev, unsigned long addr)
> > > +{
> > > +    struct rpcif_hyperbus *hyperbus =
> > > +        container_of(hbdev, struct rpcif_hyperbus, hbdev);
> > > +    struct rpcif_op op = rpcif_op_tmpl;
> > > +    map_word data;
> > > +
> > > +    op.cmd.opcode = 0xC0;
> > > +    op.addr.val = addr >> 1;
> > > +    op.dummy.buswidth = 1;
> > > +    op.dummy.ncycles = 15;
> > > +    op.data.dir = RPCIF_DATA_IN;
> > > +    op.data.nbytes = 2;
> > > +    op.data.buf.in = &data;
> > > +    rpcif_prepare(&hyperbus->rpc, &op, NULL, NULL); // ?
> > > +    rpcif_io_xfer(&hyperbus->rpc);
> > > +
> > > +    return be16_to_cpu(data.x[0]);
> > > +}
> > > +
> > > +static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr,
> > > +                 u16 data)
> > > +{
> > > +    struct rpcif_hyperbus *hyperbus =
> > > +        container_of(hbdev, struct rpcif_hyperbus, hbdev);
> > > +    struct rpcif_op op = rpcif_op_tmpl;
> > > +
> > > +    op.cmd.opcode = 0x40;
> > > +    op.addr.val = addr >> 1;
> > > +    op.data.dir = RPCIF_DATA_OUT;
> > > +    op.data.nbytes = 2;
> > > +    op.data.buf.out = &data;
> > > +    cpu_to_be16s(&data);
> >
> >
> >
> > Testing this, I found that writing data to the Hyperflash results in swapped _data_ in Hyperflash due to this cpu_to_be16s() conversion:
> >
> > 02 01 04 03 06 05 08 07 ...
> >
> > Breaking the usage of the data written for other users, i.e. the boot loaders.
> >
> > On the other hand, dropping this cpu_to_be16s() (and be16_to_cpu() in the read16 above) makes the probing to fail completely.
> >
> > The topic seems to be that rpcif_hb_write16() handles command _and_ data, and the commands seem to need the conversion.
>
>     The HyperBus spec says the register space is always big-endian but the again
> HypoerFlash doesn't have the register space...
>
> > As mentioned, the first idea, dropping the conversion and adding some debug output in the driver [1] results in failed probe [2]. Successful probing of the unmodified driver  results in [3], then.
> >
> > Seems I need some advice: Why is this conversion for successful probe required?
> > Why is the first 'QRY' returned by the device not detected by cfi_qry_mode_on()?
>
>     "QRY" is in the MSBs?


Well, even if we have swapping enabled and with this it's in the LSBs, 
it's not detected in the first run. See the first 5 traces in [3] below.


> > Is the any possibility to drop the conversion _and_ make the driver probe successful? Or do we need to split the path the commands and the data are routed? If so, how?
>
>     I've found some interesting options under the CFI advanced config options,
> e.g. "Flash cmd/query data swapping" having MTD_CFI_BE_BYTE_SWAP value in this
> item. With this variant chosen, I don't need any byte swapping in the driver
> any more... and the QRY signature is read correctly on the very 1st try.


Yes, but ;)

I tried MTD_CFI_BE_BYTE_SWAP config option, too. Enabling that and 
dropping cpu_to_be16s()/be16_to_cpu() in the driver result in a 
successful probe. And /dev/mtdx afterwards. That's the good news.

But, the bad news:

Trying a write (dd to /dev/mtdx) hanged and never returned. In 
contrast to the solution with the cpu_to_be16s()/be16_to_cpu() in the 
driver, which wrote nicely to the Hyperflash, but swapped.

Best regards

Dirk


> > Many questions ;)
>
>     Hopefully an answer was found.
>
> > Best regards
> >
> > Dirk
> >
> >
> > [1] Dropping be16_to_cpu() & cpu_to_be16s() and adding some debug output:
> >
> > diff --git a/drivers/mtd/chips/cfi_util.c b/drivers/mtd/chips/cfi_util.c
> > index 6f16552cd59f..e5dd8dd3b594 100644
> > --- a/drivers/mtd/chips/cfi_util.c
> > +++ b/drivers/mtd/chips/cfi_util.c
> > @@ -239,9 +239,13 @@ int __xipram cfi_qry_present(struct map_info *map, __u32 base,
> >   }
> >   EXPORT_SYMBOL_GPL(cfi_qry_present);
> >
> > +static unsigned int count = 1;
> > +
> >   int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
> >                               struct cfi_private *cfi)
> >   {
> > +       pr_err("cfi_qry_mode_on() called #%i\n", count++);
> > +
> >          cfi_send_gen_cmd(0xF0, 0, base, map, cfi, cfi->device_type, NULL);
> >          cfi_send_gen_cmd(0x98, 0x55, base, map, cfi, cfi->device_type, NULL);
> >          if (cfi_qry_present(map, base, cfi))
> > @@ -273,6 +277,9 @@ int __xipram cfi_qry_mode_on(uint32_t base, struct map_info *map,
> >          if (cfi_qry_present(map, base, cfi))
> >                  return 1;
> >          /* QRY not found */
> > +
> > +       pr_err("cfi_qry_mode_on() failed\n");
> > +
> >          return 0;
> >   }
> >   EXPORT_SYMBOL_GPL(cfi_qry_mode_on);
> > diff --git a/drivers/mtd/hyperbus/rpc-if.c b/drivers/mtd/hyperbus/rpc-if.c
> > index a66a5080b482..bb83a8f3f3bc 100644
> > --- a/drivers/mtd/hyperbus/rpc-if.c
> > +++ b/drivers/mtd/hyperbus/rpc-if.c
> > @@ -60,7 +60,11 @@ static u16 rpcif_hb_read16(struct hyperbus_device *hbdev, unsigned long addr)
> >          rpcif_prepare(&hyperbus->rpc, &op, NULL, NULL); // ?
> >          rpcif_io_xfer(&hyperbus->rpc);
> >
> > -       return be16_to_cpu(data.x[0]);
> > +       pr_err("read:  a: 0x%08lX  d: 0x%04X %c %c\n", addr, (unsigned short)data.x[0],
> > +              (unsigned char)((data.x[0] >> 8) & 0xFF),
> > +              (unsigned char)data.x[0]);
> > +
> > +       return data.x[0];
> >   }
> >
> >   static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr,
> > @@ -75,7 +79,7 @@ static void rpcif_hb_write16(struct hyperbus_device *hbdev, unsigned long addr,
> >          op.data.dir = RPCIF_DATA_OUT;
> >          op.data.nbytes = 2;
> >          op.data.buf.out = &data;
> > -       cpu_to_be16s(&data);
> > +       pr_err("write: a: 0x%08lX  d: 0x%04X\n", addr, data);
> >          rpcif_prepare(&hyperbus->rpc, &op, NULL, NULL); // ?
> >          rpcif_io_xfer(&hyperbus->rpc);
> >   }
> >
> >
> > [2] Probe fails without be16_to_cpu/cpu_to_be16s:
> >
> > cfi_qry_mode_on() called #1
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x000000AA  d: 0x9898
> > read:  a: 0x00000020  d: 0x5100 Q
> > read:  a: 0x00000022  d: 0x5200 R
> > read:  a: 0x00000024  d: 0x5900 Y
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000000  d: 0xFFFF
> > write: a: 0x000000AA  d: 0x9898
> > read:  a: 0x00000020  d: 0x5100 Q
> > read:  a: 0x00000022  d: 0x5200 R
> > read:  a: 0x00000024  d: 0x5900 Y
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000AAA  d: 0x9898
> > read:  a: 0x00000020  d: 0x5100 Q
> > read:  a: 0x00000022  d: 0x5200 R
> > read:  a: 0x00000024  d: 0x5900 Y
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x0000AAAA  d: 0xAAAA
> > write: a: 0x00005554  d: 0x5555
> > write: a: 0x0000AAAA  d: 0x9898
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000AAA  d: 0xAAAA
> > write: a: 0x00000554  d: 0x5555
> > write: a: 0x00000AAA  d: 0x9898
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > cfi_qry_mode_on() failed
> > cfi_qry_mode_on() called #2
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000154  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000000  d: 0xFFFF
> > write: a: 0x00000154  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00001554  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00015554  d: 0xAAAA
> > write: a: 0x0000AAAA  d: 0x5555
> > write: a: 0x00015554  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00001554  d: 0xAAAA
> > write: a: 0x00000AAA  d: 0x5555
> > write: a: 0x00001554  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > cfi_qry_mode_on() failed
> > cfi_qry_mode_on() called #3
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x000002A8  d: 0x9898
> > read:  a: 0x00000080  d: 0xF358 ¦ X
> > read:  a: 0x00000088  d: 0x0057  W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000000  d: 0xFFFF
> > write: a: 0x000002A8  d: 0x9898
> > read:  a: 0x00000080  d: 0xF358 ¦ X
> > read:  a: 0x00000088  d: 0x0057  W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00002AA8  d: 0x9898
> > read:  a: 0x00000080  d: 0xF358 ¦ X
> > read:  a: 0x00000088  d: 0x0057  W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x0002AAA8  d: 0xAAAA
> > write: a: 0x00015554  d: 0x5555
> > write: a: 0x0002AAA8  d: 0x9898
> > read:  a: 0x00000080  d: 0xF358 ¦ X
> > read:  a: 0x00000088  d: 0x0057  W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00002AA8  d: 0xAAAA
> > write: a: 0x00001554  d: 0x5555
> > write: a: 0x00002AA8  d: 0x9898
> > read:  a: 0x00000080  d: 0xF358 ¦ X
> > read:  a: 0x00000088  d: 0x0057  W
> > read:  a: 0x00000090  d: 0x0000
> > cfi_qry_mode_on() failed
> > cfi_qry_mode_on() called #4
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x000000AA  d: 0x0098
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00000000  d: 0x00FF
> > write: a: 0x000000AA  d: 0x0098
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00000AAA  d: 0x0098
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x0000AAAA  d: 0x00AA
> > write: a: 0x00005554  d: 0x0055
> > write: a: 0x0000AAAA  d: 0x0098
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00000AAA  d: 0x00AA
> > write: a: 0x00000554  d: 0x0055
> > write: a: 0x00000AAA  d: 0x0098
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > cfi_qry_mode_on() failed
> > cfi_qry_mode_on() called #5
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00000154  d: 0x0098
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00000000  d: 0x00FF
> > write: a: 0x00000154  d: 0x0098
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00001554  d: 0x0098
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00015554  d: 0x00AA
> > write: a: 0x0000AAAA  d: 0x0055
> > write: a: 0x00015554  d: 0x0098
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0x00F0
> > write: a: 0x00001554  d: 0x00AA
> > write: a: 0x00000AAA  d: 0x0055
> > write: a: 0x00001554  d: 0x0098
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > cfi_qry_mode_on() failed
> > rpc-if-hyperflash rpc-if-hyperflash: probing of hyperbus device failed
> > rpc-if-hyperflash rpc-if-hyperflash: failed to register device
> >
> >
> >
> > [3] Probe success WITH be16_to_cpu/cpu_to_be16s:
> >
> > cfi_qry_mode_on() called #1
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x000000AA  d: 0x9898
> > read:  a: 0x00000020  d: 0x0051  Q
> > read:  a: 0x00000022  d: 0x0052  R
> > read:  a: 0x00000024  d: 0x0059  Y
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000000  d: 0xFFFF
> > write: a: 0x000000AA  d: 0x9898
> > read:  a: 0x00000020  d: 0x0051  Q
> > read:  a: 0x00000022  d: 0x0052  R
> > read:  a: 0x00000024  d: 0x0059  Y
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000AAA  d: 0x9898
> > read:  a: 0x00000020  d: 0x0051  Q
> > read:  a: 0x00000022  d: 0x0052  R
> > read:  a: 0x00000024  d: 0x0059  Y
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x0000AAAA  d: 0xAAAA
> > write: a: 0x00005554  d: 0x5555
> > write: a: 0x0000AAAA  d: 0x9898
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000AAA  d: 0xAAAA
> > write: a: 0x00000554  d: 0x5555
> > write: a: 0x00000AAA  d: 0x9898
> > read:  a: 0x00000020  d: 0x0000
> > read:  a: 0x00000022  d: 0x0000
> > read:  a: 0x00000024  d: 0x0000
> > cfi_qry_mode_on() failed
> > cfi_qry_mode_on() called #2
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000154  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000000  d: 0xFFFF
> > write: a: 0x00000154  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00001554  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00015554  d: 0xAAAA
> > write: a: 0x0000AAAA  d: 0x5555
> > write: a: 0x00015554  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00001554  d: 0xAAAA
> > write: a: 0x00000AAA  d: 0x5555
> > write: a: 0x00001554  d: 0x9898
> > read:  a: 0x00000040  d: 0x0000
> > read:  a: 0x00000044  d: 0x0000
> > read:  a: 0x00000048  d: 0x0000
> > cfi_qry_mode_on() failed
> > cfi_qry_mode_on() called #3
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x000002A8  d: 0x9898
> > read:  a: 0x00000080  d: 0x58F3 X ¦
> > read:  a: 0x00000088  d: 0x5700 W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00000000  d: 0xFFFF
> > write: a: 0x000002A8  d: 0x9898
> > read:  a: 0x00000080  d: 0x58F3 X ¦
> > read:  a: 0x00000088  d: 0x5700 W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00002AA8  d: 0x9898
> > read:  a: 0x00000080  d: 0x58F3 X ¦
> > read:  a: 0x00000088  d: 0x5700 W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x0002AAA8  d: 0xAAAA
> > write: a: 0x00015554  d: 0x5555
> > write: a: 0x0002AAA8  d: 0x9898
> > read:  a: 0x00000080  d: 0x58F3 X ¦
> > read:  a: 0x00000088  d: 0x5700 W
> > read:  a: 0x00000090  d: 0x0000
> > write: a: 0x00000000  d: 0xF0F0
> > write: a: 0x00002AA8  d: 0xAAAA
> > write: a: 0x00001554  d: 0x5555
> > write: a: 0x00002AA8  d: 0x9898
> > read:  a: 0x00000080  d: 0x58F3 X ¦
> > read:  a: 0x00000088  d: 0x5700 W
> > read:  a: 0x00000090  d: 0x0000
> > cfi_qry_mode_on() failed
> > cfi_qry_mode_on() called #4
> > write: a: 0x00000000  d: 0xF000
> > write: a: 0x000000AA  d: 0x9800
> > read:  a: 0x00000020  d: 0x0051  Q
> > read:  a: 0x00000022  d: 0x0052  R
> > read:  a: 0x00000024  d: 0x0059  Y
> > read:  a: 0x00000058  d: 0x0001
> > read:  a: 0x00000020  d: 0x0051  Q
> > read:  a: 0x00000022  d: 0x0052  R
> > read:  a: 0x00000024  d: 0x0059  Y
> > read:  a: 0x00000026  d: 0x0002
> > read:  a: 0x00000028  d: 0x0000
> > read:  a: 0x0000002A  d: 0x0040  @
> > read:  a: 0x0000002C  d: 0x0000
> > read:  a: 0x0000002E  d: 0x0000
> > read:  a: 0x00000030  d: 0x0000
> > read:  a: 0x00000032  d: 0x0000
> > read:  a: 0x00000034  d: 0x0000
> > read:  a: 0x00000036  d: 0x0017
> > read:  a: 0x00000038  d: 0x0019
> > read:  a: 0x0000003A  d: 0x0000
> > read:  a: 0x0000003C  d: 0x0000
> > read:  a: 0x0000003E  d: 0x0009
> > read:  a: 0x00000040  d: 0x0009
> > read:  a: 0x00000042  d: 0x000A
> >
> > read:  a: 0x00000044  d: 0x0012
> > read:  a: 0x00000046  d: 0x0002
> > read:  a: 0x00000048  d: 0x0002
> > read:  a: 0x0000004A  d: 0x0002
> > read:  a: 0x0000004C  d: 0x0002
> > read:  a: 0x0000004E  d: 0x001A
> > read:  a: 0x00000050  d: 0x0000
> > read:  a: 0x00000052  d: 0x0000
> > read:  a: 0x00000054  d: 0x0009
> > read:  a: 0x00000056  d: 0x0000
> > read:  a: 0x00000058  d: 0x0001
> > read:  a: 0x0000005A  d: 0x00FF  ¦
> > read:  a: 0x0000005C  d: 0x0000
> > read:  a: 0x0000005E  d: 0x0000
> > read:  a: 0x00000060  d: 0x0004
> > write: a: 0x00000000  d: 0xF000
> > write: a: 0x00000AAA  d: 0xAA00
> > write: a: 0x00000554  d: 0x5500
> > write: a: 0x00000AAA  d: 0x9000
> > read:  a: 0x00000000  d: 0x0001
> > read:  a: 0x00000002  d: 0x007E  ~
> > read:  a: 0x0000001C  d: 0x0070  p
> > read:  a: 0x0000001E  d: 0x0000
> > write: a: 0x00000000  d: 0xF000
> > write: a: 0x00000000  d: 0xFF00
> > cfi_qry_mode_on() called #5
> > write: a: 0x00000000  d: 0xF000
> > write: a: 0x000000AA  d: 0x9800
> > read:  a: 0x00000020  d: 0x0051  Q
> > read:  a: 0x00000022  d: 0x0052  R
> > read:  a: 0x00000024  d: 0x0059  Y
> > read:  a: 0x00000080  d: 0x0050  P
> > read:  a: 0x00000082  d: 0x0052  R
> > read:  a: 0x00000084  d: 0x0049  I
> > read:  a: 0x00000086  d: 0x0031  1
> > read:  a: 0x00000088  d: 0x0035  5
> > read:  a: 0x0000008A  d: 0x001C
> > read:  a: 0x0000008C  d: 0x0002
> > read:  a: 0x0000008E  d: 0x0001
> > read:  a: 0x00000090  d: 0x0000
> > read:  a: 0x00000092  d: 0x0008
> > read:  a: 0x00000094  d: 0x0000
> > read:  a: 0x00000096  d: 0x0001
> > read:  a: 0x00000098  d: 0x0000
> > read:  a: 0x0000009A  d: 0x0000
> > read:  a: 0x0000009C  d: 0x0000
> > read:  a: 0x0000009E  d: 0x0000
> > write: a: 0x00000000  d: 0xF000
> > write: a: 0x00000000  d: 0xFF00
> > => success
>
>
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