Re: [PATCH 4/5] ARM: Add basic support for EcoNet EN7523 SoC

On Mon, 9 Aug 2021 at 14:46, Geert Uytterhoeven [off-list ref] wrote:

Hoi Bert,

On Wed, Aug 4, 2021 at 6:43 PM Bert Vermeulen [off-list ref] wrote:

quoted

On 7/30/21 4:48 PM, Arnd Bergmann wrote:

quoted

On Fri, Jul 30, 2021 at 3:45 PM Bert Vermeulen [off-list ref] wrote:

quoted

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 173da685a52e..1bff0aa29c07 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile

@@ -152,6 +152,7 @@ textofs-$(CONFIG_ARCH_MSM8X60) := 0x00208000
 textofs-$(CONFIG_ARCH_MSM8960) := 0x00208000
 textofs-$(CONFIG_ARCH_MESON) := 0x00208000
 textofs-$(CONFIG_ARCH_AXXIA) := 0x00308000
+textofs-$(CONFIG_ARCH_ECONET) := 0x00088000

Why is this needed?

Note also the comment directly above it exlaining
# Text offset. This list is sorted numerically by address in order to
# provide a means to avoid/resolve conflicts in multi-arch kernels.

I didn't make that patch, but it turns out it's needed to get PSCI working;
detection hangs without it. That makes no sense to me, but I'll examine further.

Probably PSCI relies on the memory contents at the start of RAM not
being overwritten?
Does it help if you remove the first 512 KiB from the /memory node

I /think/ we rely on the first memblock being mappable using section
mappings, so it might be better to remove the first 1 MB (or 2 MB in
case the platform is LPAE capable). Note that this memory is discarded
in any case, so this change is not as costly as it may seem.

(which should be declared in en7523-evb.dts instead of en7523.dtsi
BTW)?

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

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

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