[LEDE-DEV] [PATCH v2] ipq806x: add kernel 4.14 support

[Joris de Vries]

Can confirm that my TP-Link Archer C2600 sysupgraded without trouble after updating the kernel partition to 4MB (of which a patch is in patchwork).

> On 17 May 2018, at 21:32, Stefan Lippers-Hollmann <s.l-h at gmx.de> wrote:
> 
> Hi
> 
> On 2018-05-17, John Crispin wrote:
>> On 17/05/18 13:47, Ram Chandra Jangir wrote:
>>> Thanks  Michael for confirming this,
>>> 
>>> Can you please help to update the kernel partition size to 4MB for R7800 and send it as patch to community (lede-dev at lists.infradead.org)?
>>> This will help to enable kernel v4.14 for all ipq806x based boards.  
>> 
>> hang on, that would break sysupgrade or not ?
> 
> At least for the NAND based devices with a 2 MB kernel partition:
> 
> - Netgear Nighthawk X4 D7800
> - Netgear Nighthawk X4 R7500
> - Netgear Nighthawk X4 R7500v2
> - Netgear Nighthawk X4S R7800
> 
> SPI-NOR based devices should migrate transparently:
> 
> - TP-Link Archer C2600
> - TP-Link Archer VR2600v
> 
> Not affected:
> 
> - Compex WPQ864 (merged ubi on NAND)
> - Linksys EA8500 (kernel partition 3 MB on NAND)
> - Qualcomm IPQ8064/DB149 (merged firmware partition, SPI-NOR)
> - ZyXEL NBG6817 (kernel partition 4 MB on eMMC/ GPT partitions)
> 
> Unknown, probably not affected:
> 
> - Qualcomm IPQ8064/AP148 (NAND, partitioning derived from qcom-smem)
> 
> The Netgear/ NAND devices will need installing the differently 
> partitioned image via tftp, therefore it might make sense to migrate
> ipq806x to qca8k/ dsa around the same time, given that the existing
> configs can't be kept over the upgrade anyways.
> 
> https://github.com/dissent1/openwrt/commit/5c17ab1f8673d6fb69163052ac7e3f71bf385405
> 
> Devices successfully tested with this patch/ kernel 4.14:
> 
> - Netgear Nighthawk X4S R7800
>  tftp 'recovery' needed to apply the new partitioning, patches for
>  DTS and image code needed
>  tested by: Michael Yartys <michael.yartys at protonmail.com>
>  Message-ID: <mailman.7267.1525467398.2282.lede-dev at lists.infradead.org>
> - TP-Link Archer C2600
>  smooth transition, patches for DTS and tplink-safeloader needed
>  tested by: Joris de Vries <j.s.de.vries at gmail.com>
>  Message-Id: <E30ACE8A-B750-4DF7-B42D-E9447425B4BC at gmail.com>
> - ZyXEL NBG6817
>  smooth sysupgrade, no patches or other changes needed
>  tested by: Stefan Lippers-Hollmann <s.l-h at gmx.de>
>  Message-ID: <20180504214003.61bbd2be at mir>
> 
> I've been running my nbg6817 successfully on kernel 4.14 for a bit over 
> two weeks now, no issues at all.
> 
> It is still possible to drop the kernel size to 2'097'152 byte by
> 
> - https://git.openwrt.org/?p=openwrt/staging/nbd.git;a=commitdiff;h=9e6c25f6940dbb294a7ba8cf8c72b659ec444ebf
>  - CONFIG_OPTIMIZE_INLINING=y
> - CONFIG_CC_OPTIMIZE_FOR_SIZE=y
> 
> But that's exactly on the limit for 2 MB, so it will overflow sooner
> than later, probably at the most inconvenient time. While
> [PATCH] ipq806x: cleanup kernel config
> Message-Id: <1526561729-32032-1-git-send-email-rjangir at codeaurora.org>
> should extend the headroom a bit more, extending the size of the kernel
> partition for the affected Netgear devices will be needed in the future
> either way, probably with the next minor kernel bump at the latest.
> 
> Regards
> 	Stefan Lippers-Hollmann


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