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Hi Stefan and Daniel,

On 8/2/20 8:19 PM, Daniel Golle wrote:
> On Sun, Aug 02, 2020 at 07:49:40PM -0300, SAn via openwrt-devel wrote:
>> Subject: ath79 subtarget with cmdline from bootloader
>>
>> Hi! 
>>
>> The LibreRouter uses a dual-boot scheme that relies on the bootloader 
>> configuring the kernel cmdline. At ar71xx 18.06 it was possible to select 
>> per device if the cmdline from the bootloader has to be honored (using 
>> patch-cmdline).
>> AFAIK there is no such possibility on ath79.
>>
>> Would you consider accepting a patch that adds a new ath79 subtarget with 
>> CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER (or CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)?
>>
>> It would be valuable for the people using LibreRouter devices to be able to 
>> use official OpenWrt 20.xx images with the dual-boot support. Currently 
>> there are multiple mips targets that use CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER 
>> (bcm47xx, octeon, malta, and a few more).
> 
> I don't think this justifies an extra subtarget just for the sake of
> having the kernel process cmdline arguments passed by an outdated
> (ie. non-DT, non-FIT) bootloader.
> If it really has to be that way (and eg. parsing uboot-env cannot be
> used instead and bootloader cannot be updated to properly pass this
.

Another bootloader can be used, but I am not aware of a newer one with QCA955x 
support, do you? The last time I checked u-boot there was upstream support to 
qca956x and qca953x. Adding support to 955x seemed to me a lot of work (there 
are thousands of undocumented constants everywhere in the code), but maybe I am 
mistaken?

I did not understand the "parsing uboot-env". Can you expand on this please? :)

> in dtb), I guess something along the lines of
> CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_MANGLE
> could work (would have to be implemented for MIPS first, obviously)

If there is no other viable way I would go this way..
Thanks Stefan for the pointers to the patches!

> Alternatively, as a quick-and-dirty workaround, just move the whole
> librerouter.dts into a .dtsi and then have two .dts files referecing
> them, each setting different cmdline. Then generate two images.
> That'd be the same effect as what patch-cmdline used to do on non-DT
> targets.
> 

I think this is too complicated for end users. Maybe a friendlier way could be 
to pack both images into a tarfile and then use the correct one from a 
userspace tool to perform the upgrade.

Thanks for the help!
SAn


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