Messages in this thread | | | From | Robert Marko <> | Date | Mon, 31 Jan 2022 14:00:25 +0100 | Subject | Re: [PATCH v9 03/13] ARM: Add basic support for Airoha EN7523 SoC |
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On Mon, Jan 31, 2022 at 1:57 PM Felix Fietkau <nbd@nbd.name> wrote: > > > On 31.01.22 11:51, Luka Perkov wrote: > > Hello Felix, > > > > On Sun, Jan 30, 2022 at 3:56 PM Felix Fietkau <nbd@nbd.name> wrote: > >> > >> From: John Crispin <john@phrozen.org> > >> > >> EN7523 is an armv8 based silicon used inside broadband access type devices > >> such as xPON and xDSL. It shares various silicon blocks with MediaTek > >> silicon such as the MT7622. > >> > >> Add basic support for Airoha EN7523, enough for booting to console. > >> > >> The UART is basically 8250-compatible, except for the clock selection. > >> A clock-frequency value is synthesized to get this to run at 115200 bps. > >> > >> Signed-off-by: John Crispin <john@phrozen.org> > >> Signed-off-by: Bert Vermeulen <bert@biot.com> > >> Signed-off-by: Felix Fietkau <nbd@nbd.name> > >> --- > >> index 000000000000..ea23b5abb478 > >> --- /dev/null > >> +++ b/arch/arm/mach-airoha/airoha.c > >> @@ -0,0 +1,16 @@ > >> +// SPDX-License-Identifier: GPL-2.0-or-later > >> +/* > >> + * Device Tree support for Airoha SoCs > >> + * > >> + * Copyright (c) 2022 Felix Fietkau <nbd@nbd.name> > >> + */ > >> +#include <asm/mach/arch.h> > >> + > >> +static const char * const airoha_board_dt_compat[] = { > >> + "airoha,en7523", > >> + NULL, > >> +}; > >> + > >> +DT_MACHINE_START(MEDIATEK_DT, "Airoha Cortex-A53 (Device Tree)") > > > > Since this is Cortex-A53 core is there a reason why this is not placed > > within arm64 directory? > From what I can tell, it's a stripped-down core that only runs in > 32-bit mode.
Hmm, this is new for me that you could do that to an ARMv8 (A53) core. I know that you can run ARMv7 code but not that you can reduce it to 32 bit only.
Regards, Robert > > - Felix
-- Robert Marko Staff Embedded Linux Engineer Sartura Ltd. Lendavska ulica 16a 10000 Zagreb, Croatia Email: robert.marko@sartura.hr Web: www.sartura.hr
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