[LEDE-DEV] [PATCH] ipq806x: Add nand boot support for ipq40xx AP-DK04.1-C1

[Christian Lamparter]

Hello,

On Friday, May 5, 2017 9:19:36 PM CEST Ram Chandra Jangir wrote:
> This change add nand boot support for IPQ40xx based
> AP-DK04.1-C1 board using ubi image, also add sysupgrage
> support for AP-DK04.1-C1 and generates a sysupgrade.tar
> image.
> 
> Testing:
> *Tested on IPQ40xx AP-DK04.1-C1 and IPQ806x AP148 Board:
>   a. NAND boot
>   b. ubi sysupgrade
> 
> Signed-off-by: Ram Chandra Jangir <rjangir at codeaurora.org>

Thanks for posting this.

Chris Blake is currently in the process of adding the Cisco Meraki MR33.
<https://github.com/riptidewave93/LEDE-MR33>
The MR33 uses the IPQ4029 and has just a Spansion S34ML01G200TFV00 128MiB
NAND Flash for storage.

He reported that with this patch attached. The driver is loading, but it
can't access the nand: 

[    0.860703] nand: second ID read did not match 7f,7f against 01,71
[    0.861633] nand: No NAND device found

The id is supposed to be 01 (manuf = Spanion), f1 (128MiB).
both readings are bad.

I think this is caused by two problems:

1. 7f, 7f should be 0xff, 0xff. 0x71 should be 0xf1.

2. It seems that the NAND chip was not ready on the first read. 

I strongly suspect (due to the MSB error for BIT 7), that
at least one I/O line is missing due to a bad pinctrl/mux
setup.

Could you please add the pinctrl nand definitions to
the dts so he can test again?

Regards,
Christian