Hi Magnus, On Sun, Sep 12, 2021 at 7:40 AM Magnus Damm <magnus.damm@xxxxxxxxx> wrote: > On Sun, Sep 12, 2021 at 4:32 AM Marc Zyngier <maz@xxxxxxxxxx> wrote: > > On Sat, 11 Sep 2021 03:49:20 +0100, > > Magnus Damm <magnus.damm@xxxxxxxxx> wrote: > > > On Fri, Sep 10, 2021 at 10:19 PM Geert Uytterhoeven > > > <geert@xxxxxxxxxxxxxx> wrote: > > > > On Fri, Sep 10, 2021 at 12:23 PM Marc Zyngier <maz@xxxxxxxxxx> wrote: > > > > > On Thu, 09 Sep 2021 16:22:01 +0100, > > > > > Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote: > > > > GIC: enabling workaround for broken byte access > > > > > > Indeed, byte access is unsupported according to the EMEV2 documentation. > > > > > > The EMEV2 documentation R19UH0036EJ0600 Chapter 7 Interrupt Control on > > > page 97 says: > > > "Interrupt registers can be accessed via the APB bus, in 32-bit units" > > > "For details about register functions, see ARM Generic Interrupt > > > Controller Architecture Specification Architecture version 1.0" > > > The file "R19UH0036EJ0600_1Chip.pdf" is the 6th edition version > > > published in 2010 and is not marked as confidential. > > > > This is as bad as it gets. Do you know if any other Renesas platform > > is affected by the same issue? > > Next time we have a beer together I would be happy to show you some > legacy interrupt controller code. =) > > EMEV2 and the Emma Mobile product line came from the NEC Electronics > side that got merged into Renesas Electronics in 2010. Historically > NEC Electronics mainly used MIPS I've been told, and the Emma Mobile > SoCs were one of the earlier Cortex-A9 adopters. That might have > something to do with the rather loose interpretation of the spec. Indeed. I used to work on products using EMMA1 and EMMA2, and they were MIPS-based (vr4120A for EMMA2, IIRC). Later variants (EMMA2H and EMMA3?) did include a small ARM core for standby control. > Renesas SoCs from a similar era: > AP4 (sh7372) AP4EVB (Cortex-A8 + INTCA/INTCS) This is no longer supported upstream (and not affected, as no GIC). > R-Mobile A1 (r8a7740) Armadillo-800-EVA (Cortex-A9 + INTCA/INTCS) R-Mobile A1 has GIC (PL390), too, and is not affected. > R-Car M1A (r8a7778) Bock-W (Cortex-A9 + GIC) > R-Car H1 (r8a7779) Marzen (4 x Cortex-A9 + GIC) > Emma Mobile EMEV2 KZM9D (2 x Cortex-A9 + GIC) > SH-Mobile AG5 (sh73a0) KZM9G (2 x Cortex-A9 + GIC) All of these (except for EMEV2) are fine, too. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds