On 01/15/2017 03:43 PM, Andreas Färber wrote: > Am 13.01.2017 um 21:03 schrieb Kevin Hilman: >> Neil Armstrong <narmstr...@baylibre.com> writes: >> >>> The Amlogic Meson GXBB/GXL/GXM secure monitor uses part of the memory space, >>> this patch adds this reserved zone and redefines the usable memory range. >>> >>> The memory node is also moved from the dtsi files into the proper dts files >>> to handle variants memory sizes. >>> >>> This patch also fixes the memory sizes for the following platforms : >>> - gxl-s905x-p212 : 1GiB instead of 2GiB, a proper 2GiB dts should be pushed >>> - gxm-s912-q201 : 1GiB instead of 2GiB, a proper 2GiB dts should be pushed >>> - gxl-s905d-p231 : 1GiB instead of 2GiB, a proper 2GiB dts should be pushed >>> - gxl-nexbox-a95x : 1GiB instead of 2GiB, a proper 2GiB dts should be pushed >>> >>> Signed-off-by: Neil Armstrong <narmstr...@baylibre.com> >> >> Queued for v4.10-rc. > > What is the motivation for this change? I have a local U-Boot patch to > detect the amount of memory available as done downstream, but U-Boot > only updates the reg property that you seem to be abandoning here... > > So for devices that come in multiple RAM configurations - like R-Box Pro > - this would require separate .dts files now! This looks very wrong to > me, especially since I am not aware of other platforms doing the same. > Instead, there's memory reservations for top and bottom done in U-Boot > for reg, plus reserved-memory nodes for anything in the middle. > > Another thing to consider is that uEFI boot (bootefi) handles memory > reservation differently yet again, on the bootloader level. I have had > that working fine on Odroid-C2 and Vega S95. > > So if there's no bug this is fixing (none mentioned in commit message) I > strongly object to this patch. > > Regards, > Andreas >
Hi Andreas, Like I replied of my RFT patch : I really disagree about relying on any work or properties added by any bootloader here, Amlogic SoCs has a lot of u-boot versions in the field, and the Odroid-C2 is part of this. Even if Odroid-c2 is in mainline U-Boot or not, the mainline Linux kernel should work using any U-boot version even with the one provided by Amlogic on their openlinux distribution channel. Handling multiple RAM configuration is another story, and the Arm-Soc and DT maintainers should give us their advices. Actually there is a severe bug fixed here that cause a huge crash if such memory is not reserved while running stock u-boot version on various shipped products and Amlogic's own development boards. The bug is easily triggered by running : # stress --vm 4 --vm-bytes 128M --timeout 10s & [ 46.937975] Bad mode in Error handler detected on CPU1, code 0xbf000000 -- SError ... [ 47.058536] Internal error: Attempting to execute userspace memory: 8600000f [#3] PREEMPT SMP ... Note this is a fix targeted for 4.10 to make the system stable and various users reported some severe crash now the system has more drivers and read-world use-cases are running on Amlogic SoCs. Please feel free to push whatever changes that makes this memory reservation more coherent for 4.11, and respect the behavior of already shipped u-boot version and mainline U-Boot, UEFI, whatever... Neil
