[PATCH] ARM: dts: da850-lcdk: Add NAND to DT

[Sekhar Nori]

On Thursday 01 September 2016 05:14 AM, Kevin Hilman wrote:
> Karl Beldan <kbeldan at baylibre.com> writes:
> 
>> This adds DT support for the NAND connected to the SoC AEMIF.
>> Passed torture hashing a 40MB file on top of UBIFS using subpages.
>>
>> Signed-off-by: Karl Beldan <kbeldan at baylibre.com>
>> ---
>> v2:
>>
>> - Removed comments pertaining to the BSP the LCDK ships with (Sekhar)
>> - s/"ok"/"okay"/
>> - Removed partitions since it relates to the BSP the LCDK ships with
> 
> IMO, some default partitions are nice to have, at least for u-boot and
> u-boot env so factory-shipped u-boot is not accidentally overridden.
> The left over space can be labeled "free space".
> 
> Anyways, after adding some partitions back, I tested with ubifs on my
> LCDK:

This[1] is what I had commented on the partitions before. I did not 
mean to remove partitions altogether, just comments referring to 
compatibility with pre-flashed software shipping with LCDK (since that 
changes without notice).

Apologies for any confusion caused. The "Rest of the patch looks good
to me" in the end was to say that the partitions themselves look fine :)

Can you please submit a v2 with partitions added?

Thanks,
Sekhar

[1]

> +
> +			/*
> +			 * LCDK original partitions:
> +			 * 0x000000000000-0x000000020000 : "u-boot env"
> +			 * 0x000000020000-0x0000000a0000 : "u-boot"
> +			 * 0x0000000a0000-0x0000002a0000 : "kernel"
> +			 * 0x0000002a0000-0x000020000000 : "filesystem"
> +			 *
> +			 * The 1st NAND block being guaranted to be valid w/o ECC (> 1k cycles),
> +			 * it makes a perfect candidate as an SPL for the BootROM to jump to.
> +			 * However the OMAP-L132/L138 Bootloader doc SPRAB41E reads:
> +			 * "To boot from NAND Flash, the AIS should be written to NAND block 1
> +			 * (NAND block 0 is not used by default)", which matches the LCDK
> +			 * original partitioning.

FWIW, silicon version 2.1 supports booting from block 0, but needs new
boot pin settings not possible in stock LCDK.

> +			 * Also, the LCDK ships with only the u-boot partition provisioned and
> +			 * boots on it in its default configuration while using the MMC for the
> +			 * kernel and rootfs, so preserve that one as is for now.
> +			 * [1]: Ensuring for example that U-Boot LCDK SPL can handle it properly
> +			 * and a proper boot chain ROM->SPL->U-Boot->Linux wrt ECC, would allow
> +			 * for a better partitioning.
> +			 */

I would rather not refer to the software that LCDK ships with in the
comments at all. Because that can change without notice. At some point,
if mainline kernel works well enough on LCDK, TI might decide to ship
LCDKs with mainline kernel flashed.

> +			partitions {
> +				compatible = "fixed-partitions";
> +				#address-cells = <1>;
> +				#size-cells = <1>;
> +
> +				partition at 0 {
> +					label = "u-boot env";
> +					reg = <0 0x020000>;
> +				};
> +				partition at 0x020000 {
> +					/* The LCDK defaults to booting from this partition */
> +					label = "u-boot";
> +					reg = <0x020000 0x080000>;
> +				};
> +				partition at 0x0a0000 {
> +					label = "space";
> +					reg = <0x0a0000 0>;
> +				};
> +			};
> +		};
> +	};
> +};

Rest of the patch looks good to me.

Regards,
Sekhar