On Thu, Sep 3, 2020, 6:58 AM Christian Mauderer < christian.maude...@embedded-brains.de> wrote:
> Hello Kinsey, > > On 01/09/2020 23:56, Kinsey Moore wrote: > > Hi, > > > > I’ve been working on proper AArch64 support for RTEMS > > That's great. It means good raspberry pi 4 support ;-) > > > (versus running > > 32-bit ARM RTEMS behind a bootloader or JTAG device that switches the > > CPU to AArch32 mode) and while the vast majority of the architecture > > support code is new, lives in its own aarch64 directories, and is > > unrelated to RTEMS’s ARM support, there are several drivers living in > > the ARM shared directory that are critical to AArch64 support and many > > more that could potentially be shared. Given the limited scope of > > initial bringup on Qemu, that list is currently: GICv3, GPT(timer), and > > PL011(uart). I don’t really see a precedent for this type of sharing > > other than the global bsps/shared and bsps/include directories. The > > global shared directories might make sense for the PL011 since it could > > theoretically be used by anything that supports AXI/AMBA, but the GIC > > and GPT drivers rely on ARM system registers to function with both > > AArch32 and AArch64. > > > > > > > > In short, where should the GICv3 and GPT drivers be relocated along with > > their associated headers, if at all? > > > > I might get a similar problem with some drivers shared between some > PowerPC and ARM too (NXP reuses some of the Freescale PowerPC > peripherals in up to date ARM controllers). I think in theory we already > have such drivers that maybe should be shared but are copied or > re-implemented in multiple BSPs instead. > The Gaisler IP drivers were moved up in the tree recently also. > One possibility might would be to add all arm/shared to the aarch64 too. > But that is a bit unclear > shared/arm?? shared/nxp Or shared/IP/vendor? They need to be above a single architecture to be shared across architectures. This is just SoC IP modules that are being reused. > > But as long as the drivers compile for every BSP and are removed at link > time they maybe could just be moved to the general shared directory. We > also have other drivers the re that are only used on a few BSPs. For > example the drivers in shared/net/* or shared/dev/ide/* > > Best regards > > Christian > > > > > > > Thanks, > > > > Kinsey Moore > > > > > > _______________________________________________ > > devel mailing list > > devel@rtems.org > > http://lists.rtems.org/mailman/listinfo/devel > > > > -- > -------------------------------------------- > embedded brains GmbH > Herr Christian Mauderer > Dornierstr. 4 > D-82178 Puchheim > Germany > email: christian.maude...@embedded-brains.de > Phone: +49-89-18 94 741 - 18 > Fax: +49-89-18 94 741 - 08 > PGP: Public key available on request. > > Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG. > _______________________________________________ > devel mailing list > devel@rtems.org > http://lists.rtems.org/mailman/listinfo/devel >
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