[PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Potin Lai]

In AST2600, the unit of SPI CEx decoding range register is 1MB, and end
address offset is set to the acctual offset - 1MB. If the flash only has
1MB, the end address will has same value as start address, which will
causing unexpected errors.

This patch set the decoding size to at least 2MB to avoid decoding errors.

Tested:
root@bletchley:~# dmesg | grep "aspeed-smc 1e631000.spi: CE0 window"
[   59.328134] aspeed-smc 1e631000.spi: CE0 window resized to 2MB (AST2600 Decoding)
[   59.343001] aspeed-smc 1e631000.spi: CE0 window [ 0x50000000 - 0x50200000 ] 2MB
root@bletchley:~# devmem 0x1e631030
0x00100000

Signed-off-by: Potin Lai <potin.lai@quantatw.com>
---
 drivers/mtd/spi-nor/controllers/aspeed-smc.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/mtd/spi-nor/controllers/aspeed-smc.c b/drivers/mtd/spi-nor/controllers/aspeed-smc.c
index 416ea247f843..6db35732c0fb 100644
--- a/drivers/mtd/spi-nor/controllers/aspeed-smc.c
+++ b/drivers/mtd/spi-nor/controllers/aspeed-smc.c
@@ -781,6 +781,17 @@ static u32 aspeed_smc_chip_set_segment(struct aspeed_smc_chip *chip)
 			 chip->cs, size >> 20);
 	}
 
+	/*
+	 * The decoding size of AST2600 SPI controller should set at
+	 * least 2MB.
+	 */
+	if (controller->info == &spi_2600_info && size < SZ_2M) {
+		size = SZ_2M;
+		dev_info(chip->nor.dev,
+			 "CE%d window resized to %dMB (AST2600 Decoding)",
+			 chip->cs, size >> 20);
+	}
+
 	ahb_base_phy = controller->ahb_base_phy;
 
 	/*
-- 
2.17.1

Re: [SPAM] [PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Cédric Le Goater]

Hello Potin,

On 3/4/22 18:07, Potin Lai wrote:
> In AST2600, the unit of SPI CEx decoding range register is 1MB, and end
> address offset is set to the acctual offset - 1MB. If the flash only has
> 1MB, the end address will has same value as start address, which will
> causing unexpected errors.

Yes. That's probably true.
  
> This patch set the decoding size to at least 2MB to avoid decoding errors.
>
> Tested:
> root@bletchley:~# dmesg | grep "aspeed-smc 1e631000.spi: CE0 window"

Could you send all the "aspeed-smc" logs please ? I would like to
reproduce on QEMU. You can use these machine options :

   fmc-model=<string>     - Change the FMC Flash model
   spi-model=<string>     - Change the SPI Flash model

to change the default flash device models and see how the driver reacts.
Add -trace aspeed_smc_flash_set_segment to see how the QEMU model is
configured.

> [   59.328134] aspeed-smc 1e631000.spi: CE0 window resized to 2MB (AST2600 Decoding)
> [   59.343001] aspeed-smc 1e631000.spi: CE0 window [ 0x50000000 - 0x50200000 ] 2MB
> root@bletchley:~# devmem 0x1e631030
> 0x00100000

I thought devmem was banned :)

We could expose the main FMC/SPI registers under sysfs or debugfs.
The segment registers and the timing registers would be nice to
have. I can revive some experimental patch I did a few years ago.

If you have some time, could you please try the new driver based
on spi-mem ?

v3 is pushed here :

   https://github.com/legoater/linux/commits/openbmc-5.15

The patch looks correct but we also want to fix the new driver and
I have reworked the window setting part. It should be less fragile.
aspeed_spi_chip_adjust_window() still needs to handle HW quirks
though.

Thanks,

C.

> Signed-off-by: Potin Lai <potin.lai@quantatw.com>
> ---
>   drivers/mtd/spi-nor/controllers/aspeed-smc.c | 11 +++++++++++
>   1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/controllers/aspeed-smc.c b/drivers/mtd/spi-nor/controllers/aspeed-smc.c
> index 416ea247f843..6db35732c0fb 100644
> --- a/drivers/mtd/spi-nor/controllers/aspeed-smc.c
> +++ b/drivers/mtd/spi-nor/controllers/aspeed-smc.c
> @@ -781,6 +781,17 @@ static u32 aspeed_smc_chip_set_segment(struct aspeed_smc_chip *chip)
>   			 chip->cs, size >> 20);
>   	}
>   
> +	/*
> +	 * The decoding size of AST2600 SPI controller should set at
> +	 * least 2MB.
> +	 */
> +	if (controller->info == &spi_2600_info && size < SZ_2M) {
> +		size = SZ_2M;
> +		dev_info(chip->nor.dev,
> +			 "CE%d window resized to %dMB (AST2600 Decoding)",
> +			 chip->cs, size >> 20);
> +	}
> +
>   	ahb_base_phy = controller->ahb_base_phy;
>   
>   	/*

Re: [SPAM] [PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Cédric Le Goater]

On 3/4/22 18:29, Cédric Le Goater wrote:
> Hello Potin,
> 
> On 3/4/22 18:07, Potin Lai wrote:
>> In AST2600, the unit of SPI CEx decoding range register is 1MB, and end
>> address offset is set to the acctual offset - 1MB. If the flash only has
>> 1MB, the end address will has same value as start address, which will
>> causing unexpected errors.
> 
> Yes. That's probably true.
> 
>> This patch set the decoding size to at least 2MB to avoid decoding errors.
>>
>> Tested:
>> root@bletchley:~# dmesg | grep "aspeed-smc 1e631000.spi: CE0 window"
> 
> Could you send all the "aspeed-smc" logs please ? I would like to
> reproduce on QEMU. You can use these machine options :
> 
>    fmc-model=<string>     - Change the FMC Flash model
>    spi-model=<string>     - Change the SPI Flash model
> 
> to change the default flash device models and see how the driver reacts.
> Add -trace aspeed_smc_flash_set_segment to see how the QEMU model is
> configured.
> 
>> [   59.328134] aspeed-smc 1e631000.spi: CE0 window resized to 2MB (AST2600 Decoding)
>> [   59.343001] aspeed-smc 1e631000.spi: CE0 window [ 0x50000000 - 0x50200000 ] 2MB
>> root@bletchley:~# devmem 0x1e631030
>> 0x00100000
> 
> I thought devmem was banned :)
> 
> We could expose the main FMC/SPI registers under sysfs or debugfs.
> The segment registers and the timing registers would be nice to
> have. I can revive some experimental patch I did a few years ago.
> 
> If you have some time, could you please try the new driver based
> on spi-mem ?
> 
> v3 is pushed here :
> 
>    https://github.com/legoater/linux/commits/openbmc-5.15
> 
> The patch looks correct but we also want to fix the new driver and
> I have reworked the window setting part. It should be less fragile.
> aspeed_spi_chip_adjust_window() still needs to handle HW quirks
> though.

Using a mx25l1606e on SPI1, here is what we get :

$ qemu-system-arm -M ast2600-evb,spi-model=mx25l1606e ....

[    1.069297] spi-aspeed-smc 1e630000.spi: registered master spi1
[    1.069863] spi-aspeed-smc 1e630000.spi: CE0 default window [ 0x30000000 - 0x37ffffff ] 128MB
[    1.070161] spi-aspeed-smc 1e630000.spi: CE0 setup done
[    1.070359] spi spi1.0: setup mode 0, 8 bits/w, 100000000 Hz max --> 0
[    1.071245] spi-aspeed-smc 1e630000.spi: CE0 read OP 0x9f mode:1.0.0.1 naddr:0x0 ndummies:0x0 len:0x6
[    1.071747] spi-nor spi1.0: mx25l1606e (2048 Kbytes)
aspeed_smc_flash_set_segment CS0 segreg=0x100000 [ 0x30000000 - 0x30200000 ]
[    1.072253] spi-aspeed-smc 1e630000.spi: CE0 new window [ 0x30000000 - 0x301fffff ] 2MB
aspeed_smc_flash_set_segment CS1 segreg=0x7f00020 [ 0x30200000 - 0x38000000 ]
[    1.072833] spi-aspeed-smc 1e630000.spi: CE1 new window [ 0x30200000 - 0x37ffffff ] 126MB
[    1.073162] spi-aspeed-smc 1e630000.spi: calculate timing compensation - AHB freq: 200 MHz
[    1.079692] spi-aspeed-smc 1e630000.spi: Trying HCLK/5 [000b0d41] ...
[    1.143327] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
[    1.143642] spi-aspeed-smc 1e630000.spi: Trying HCLK/4 [000b0641] ...
[    1.207062] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
[    1.207404] spi-aspeed-smc 1e630000.spi: Trying HCLK/3 [000b0e41] ...
[    1.273171] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
[    1.273512] spi-aspeed-smc 1e630000.spi: Trying HCLK/2 [000b0741] ...
[    1.341648] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
[    1.341942] spi-aspeed-smc 1e630000.spi: Found good read timings at HCLK/2
[    1.342190] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0741]
[    1.363662] spi-aspeed-smc 1e630000.spi: registered child spi1.0

The new spi-mem driver behaves better (on QEMU).

Thanks,

C.

Re: [SPAM] [PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Potin Lai (賴柏廷)]

Cédric Le Goater 於 2022/3/5 上午 02:00 寫道:
> On 3/4/22 18:29, Cédric Le Goater wrote:
>> Hello Potin,
>>
>> On 3/4/22 18:07, Potin Lai wrote:
>>> In AST2600, the unit of SPI CEx decoding range register is 1MB, and end
>>> address offset is set to the acctual offset - 1MB. If the flash only has
>>> 1MB, the end address will has same value as start address, which will
>>> causing unexpected errors.
>>
>> Yes. That's probably true.
>>
>>> This patch set the decoding size to at least 2MB to avoid decoding errors.
>>>
>>> Tested:
>>> root@bletchley:~# dmesg | grep "aspeed-smc 1e631000.spi: CE0 window"
>>
>> Could you send all the "aspeed-smc" logs please ? I would like to
>> reproduce on QEMU. You can use these machine options :
>>
>>    fmc-model=<string>     - Change the FMC Flash model
>>    spi-model=<string>     - Change the SPI Flash model
>>
>> to change the default flash device models and see how the driver reacts.
>> Add -trace aspeed_smc_flash_set_segment to see how the QEMU model is
>> configured.
>>
Hi Cédric,

I set spi-model with "mx25l8005", which is actual 1MB flash we are using. Please have a look with logs below.


- Original aspeed-smc.c

[    0.562453] aspeed-smc 1e630000.spi: Using 100 MHz SPI frequency
[    0.562792] aspeed-smc 1e630000.spi: mx25l8005 (1024 Kbytes)
aspeed_smc_flash_set_segment CS0 segreg=0x0 [ 0x30000000 - 0x30000000 ]
[    0.563207] aspeed-smc 1e630000.spi: CE0 window [ 0x30000000 - 0x30100000 ] 1MB
[    0.563377] aspeed-smc 1e630000.spi: CE1 window [ 0x30100000 - 0x30100000 ] 0MB (disabled)
[    0.563593] aspeed-smc 1e630000.spi: read control register: 000b0045
[    0.564044] aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed


- Applied with this patch

[    0.589828] aspeed-smc 1e630000.spi: Using 100 MHz SPI frequency
[    0.590186] aspeed-smc 1e630000.spi: mx25l8005 (1024 Kbytes)
[    0.590410] aspeed-smc 1e630000.spi: CE0 window resized to 2MB (AST2600 Decoding)
aspeed_smc_flash_set_segment CS0 segreg=0x100000 [ 0x30000000 - 0x30200000 ]
[    0.590814] aspeed-smc 1e630000.spi: CE0 window [ 0x30000000 - 0x30200000 ] 2MB
[    0.590996] aspeed-smc 1e630000.spi: CE1 window [ 0x30200000 - 0x30200000 ] 0MB (disabled)
[    0.591184] aspeed-smc 1e630000.spi: read control register: 000b0045
[    0.593019] aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed


>>> [   59.328134] aspeed-smc 1e631000.spi: CE0 window resized to 2MB (AST2600 Decoding)
>>> [   59.343001] aspeed-smc 1e631000.spi: CE0 window [ 0x50000000 - 0x50200000 ] 2MB
>>> root@bletchley:~# devmem 0x1e631030
>>> 0x00100000
>>
>> I thought devmem was banned :)
>>
>> We could expose the main FMC/SPI registers under sysfs or debugfs.
>> The segment registers and the timing registers would be nice to
>> have. I can revive some experimental patch I did a few years ago.
>>
>> If you have some time, could you please try the new driver based
>> on spi-mem ?
>>
>> v3 is pushed here :
>>
>>    https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Flegoater%2Flinux%2Fcommits%2Fopenbmc-5.15&amp;data=04%7C01%7Cpotin.lai%40quantatw.com%7C8718347359824295b40408d9fe08e189%7C179b032707fc4973ac738de7313561b2%7C1%7C0%7C637820136390590807%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=ZdTzgpoSZRgOqifP%2BuBj%2FXWm1dgDmwiHTN%2FaVPibT8o%3D&amp;reserved=0
>>
>> The patch looks correct but we also want to fix the new driver and
>> I have reworked the window setting part. It should be less fragile.
>> aspeed_spi_chip_adjust_window() still needs to handle HW quirks
>> though.
>
I tested with spi-mem v3 patch, it looks same issue appeared. (spi-model=mx25l800)


[    0.541050] spi-nor spi1.0: mx25l8005 (1024 Kbytes)
aspeed_smc_flash_set_segment CS0 segreg=0x0 [ 0x30000000 - 0x30000000 ]
aspeed_smc_flash_set_segment CS1 segreg=0x7f00010 [ 0x30100000 - 0x38000000 ]
[    0.541976] spi-aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed
[    0.542267] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0041]

I think the model mx25l1606e you tested is 2MB flash.


Thanks,
Potin
> Using a mx25l1606e on SPI1, here is what we get :
>
> $ qemu-system-arm -M ast2600-evb,spi-model=mx25l1606e ....
>
> [    1.069297] spi-aspeed-smc 1e630000.spi: registered master spi1
> [    1.069863] spi-aspeed-smc 1e630000.spi: CE0 default window [ 0x30000000 - 0x37ffffff ] 128MB
> [    1.070161] spi-aspeed-smc 1e630000.spi: CE0 setup done
> [    1.070359] spi spi1.0: setup mode 0, 8 bits/w, 100000000 Hz max --> 0
> [    1.071245] spi-aspeed-smc 1e630000.spi: CE0 read OP 0x9f mode:1.0.0.1 naddr:0x0 ndummies:0x0 len:0x6
> [    1.071747] spi-nor spi1.0: mx25l1606e (2048 Kbytes)
> aspeed_smc_flash_set_segment CS0 segreg=0x100000 [ 0x30000000 - 0x30200000 ]
> [    1.072253] spi-aspeed-smc 1e630000.spi: CE0 new window [ 0x30000000 - 0x301fffff ] 2MB
> aspeed_smc_flash_set_segment CS1 segreg=0x7f00020 [ 0x30200000 - 0x38000000 ]
> [    1.072833] spi-aspeed-smc 1e630000.spi: CE1 new window [ 0x30200000 - 0x37ffffff ] 126MB
> [    1.073162] spi-aspeed-smc 1e630000.spi: calculate timing compensation - AHB freq: 200 MHz
> [    1.079692] spi-aspeed-smc 1e630000.spi: Trying HCLK/5 [000b0d41] ...
> [    1.143327] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
> [    1.143642] spi-aspeed-smc 1e630000.spi: Trying HCLK/4 [000b0641] ...
> [    1.207062] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
> [    1.207404] spi-aspeed-smc 1e630000.spi: Trying HCLK/3 [000b0e41] ...
> [    1.273171] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
> [    1.273512] spi-aspeed-smc 1e630000.spi: Trying HCLK/2 [000b0741] ...
> [    1.341648] spi-aspeed-smc 1e630000.spi:   * [00000000] 0 HCLK delay, DI delay none : PASS
> [    1.341942] spi-aspeed-smc 1e630000.spi: Found good read timings at HCLK/2
> [    1.342190] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0741]
> [    1.363662] spi-aspeed-smc 1e630000.spi: registered child spi1.0
>
> The new spi-mem driver behaves better (on QEMU).
>
> Thanks,
>
> C.

Re: [SPAM] [PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Cédric Le Goater]

> I tested with spi-mem v3 patch, it looks same issue appeared. (spi-model=mx25l800)
> 
> 
> [    0.541050] spi-nor spi1.0: mx25l8005 (1024 Kbytes)
> aspeed_smc_flash_set_segment CS0 segreg=0x0 [ 0x30000000 - 0x30000000 ]
> aspeed_smc_flash_set_segment CS1 segreg=0x7f00010 [ 0x30100000 - 0x38000000 ]
> [    0.541976] spi-aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed
> [    0.542267] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0041]
> 
> I think the model mx25l1606e you tested is 2MB flash.

Indeed. Thanks for the test of v3. We should send a followup patch
for this 2MB restriction on the minimum size of the flash when the
patchset is merged or I will if a v4 is asked for.

This patch can be applied to the current driver.

Thanks,

C.

Re: [SPAM] [PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Cédric Le Goater]

On 3/7/22 08:57, Cédric Le Goater wrote:
> 
>> I tested with spi-mem v3 patch, it looks same issue appeared. (spi-model=mx25l800)
>>
>>
>> [    0.541050] spi-nor spi1.0: mx25l8005 (1024 Kbytes)
>> aspeed_smc_flash_set_segment CS0 segreg=0x0 [ 0x30000000 - 0x30000000 ]
>> aspeed_smc_flash_set_segment CS1 segreg=0x7f00010 [ 0x30100000 - 0x38000000 ]
>> [    0.541976] spi-aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed
>> [    0.542267] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0041]
>>
>> I think the model mx25l1606e you tested is 2MB flash.
> 
> Indeed. Thanks for the test of v3. We should send a followup patch
> for this 2MB restriction on the minimum size of the flash when the
> patchset is merged or I will if a v4 is asked for.

Here is an updated version for the spi-mem driver :

   https://github.com/legoater/linux/commit/418126725d11863b7b51b70ff507d1da6db192c3
Thanks,

C.

Re: [SPAM] [PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Potin Lai (賴柏廷)]

Cédric Le Goater 於 2022/3/8 上午 02:28 寫道:
> On 3/7/22 08:57, Cédric Le Goater wrote:
>>
>>> I tested with spi-mem v3 patch, it looks same issue appeared. (spi-model=mx25l800)
>>>
>>>
>>> [    0.541050] spi-nor spi1.0: mx25l8005 (1024 Kbytes)
>>> aspeed_smc_flash_set_segment CS0 segreg=0x0 [ 0x30000000 - 0x30000000 ]
>>> aspeed_smc_flash_set_segment CS1 segreg=0x7f00010 [ 0x30100000 - 0x38000000 ]
>>> [    0.541976] spi-aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed
>>> [    0.542267] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0041]
>>>
>>> I think the model mx25l1606e you tested is 2MB flash.
>>
>> Indeed. Thanks for the test of v3. We should send a followup patch
>> for this 2MB restriction on the minimum size of the flash when the
>> patchset is merged or I will if a v4 is asked for.
>
> Here is an updated version for the spi-mem driver :
>
>   https://apc01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Flegoater%2Flinux%2Fcommit%2F418126725d11863b7b51b70ff507d1da6db192c3&data=04%7C01%7CPotin.Lai%40quantatw.com%7Cde46d26422ae4f2dbd1708da0068575f%7C179b032707fc4973ac738de7313561b2%7C1%7C0%7C637822745417263929%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&sdata=D594iU1%2BDbDcvC%2BPP1yUWSLhGxlCGfGC4qWXh0QJoH4%3D&reserved=0
> Thanks,
>
> C.


Thanks for taking this patch into spi-mem driver, the tested log as below.

[    1.945705] spi-nor spi1.0: mx25l8005 (1024 Kbytes)
[    1.945926] spi-aspeed-smc 1e630000.spi: CE0 window resized to 2MB (AST2600 Decoding)
aspeed_smc_flash_set_segment CS0 segreg=0x100000 [ 0x30000000 - 0x30200000 ]
aspeed_smc_flash_set_segment CS1 segreg=0x7f00020 [ 0x30200000 - 0x38000000 ]
[    1.953083] spi-aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed
[    1.953409] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0041]


By the way, there is a small error when compiling kernel, it needs forward declare for both ast2600_spi_data & ast2600_fmc_data.

Also, I saw you add ast2600_fmc_data for resize checking as well, should I add it in aspeed-smc.c and resend the patch?

Thanks,
Potin

Re: [SPAM] [PATCH 1/1] mtd: spi-nor: aspeed: set the decoding size to at least 2MB for AST2600

[Cédric Le Goater]

> Thanks for taking this patch into spi-mem driver, the tested log as below.
> 
> [    1.945705] spi-nor spi1.0: mx25l8005 (1024 Kbytes)
> [    1.945926] spi-aspeed-smc 1e630000.spi: CE0 window resized to 2MB (AST2600 Decoding)
> aspeed_smc_flash_set_segment CS0 segreg=0x100000 [ 0x30000000 - 0x30200000 ]
> aspeed_smc_flash_set_segment CS1 segreg=0x7f00020 [ 0x30200000 - 0x38000000 ]
> [    1.953083] spi-aspeed-smc 1e630000.spi: Calibration area too uniform, using low speed
> [    1.953409] spi-aspeed-smc 1e630000.spi: CE0 read buswidth:1 [0x000b0041]

Thanks for the test !
  
> By the way, there is a small error when compiling kernel, it needs forward declare for both ast2600_spi_data & ast2600_fmc_data.

Ah yes ! Sorry, I pushed a wrong version. I just did an update on my tree.

May be we should introduce some helpers to identify the SoC.

> Also, I saw you add ast2600_fmc_data for resize checking as well, should I add it in aspeed-smc.c and resend the patch?

Both AST2600 controllers have the same encoding of the flash window
range, so, yes the old driver needs it.

Thanks,

C.