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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Starting to port xen on beagleboard-x15 (GSoC 2019 project)
+xen-devel Hello Julien, > I am a bit confused. Linux is able to bring-up CPU in hyp mode with the > current > U-boot. Why would we need more changes for Xen? TI's ROM code starts all CPUs in NS PL1, doesn't matter if it is boot or secondary core. If you look at Linux code [1], you'll see, that after the secondary core bringup Linux does switch that core from NS PL1 to PL2 (hyp mode) using ROM code interface (smc 0). At some moment XEN dropped all to-hyp-mode switching code. So I did switch secondaries to hyp mode in u-boot with the loop which replicates the ROM Code logic in terms of waiting for an event and checking aux registers. [1] https://elixir.bootlin.com/linux/v5.1/source/arch/arm/mach-omap2/omap-headsmp.S#L62 ANDRII ANISOV Lead Systems Engineer Office: +380 44 390 5457 x 66766 Cell: +380 50 573 8852 Email: andrii_anisov@xxxxxxxx Kyiv, Ukraine (GMT+3) epam.com CONFIDENTIALITY CAUTION AND DISCLAIMER This message is intended only for the use of the individual(s) or entity(ies) to which it is addressed and contains information that is legally privileged and confidential. If you are not the intended recipient, or the person responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. All unintended recipients are obliged to delete this message and destroy any printed copies. _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-users
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