Re: [kvm-unit-tests PATCH v6 12/32] arm64: Add support for discovering the UART through ACPI

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On 09/06/2023 08:21, Andrew Jones wrote:
On Thu, Jun 08, 2023 at 10:24:11AM -0700, Nadav Amit wrote:


On Jun 8, 2023, at 10:18 AM, Nadav Amit <nadav.amit@xxxxxxxxx> wrote:


On May 30, 2023, at 9:09 AM, Nikos Nikoleris <nikos.nikoleris@xxxxxxx> wrote:


+static void uart0_init_acpi(void)
+{
+ struct spcr_descriptor *spcr = find_acpi_table_addr(SPCR_SIGNATURE);
+
+ assert_msg(spcr, "Unable to find ACPI SPCR");
+ uart0_base = ioremap(spcr->serial_port.address, spcr->serial_port.bit_width);
+}

Is it possible as a fallback, is SPCR is not available, to UART_EARLY_BASE as
address and bit_width as bit-width?

I would appreciate it, since it would help my setup.


Ugh - typo, 8 as bit-width for the fallback (ioremap with these parameters to
make my request clear).


That sounds reasonable to me. Nikos, can you send a fixup! patch? I'll
squash it in.


I am not against this idea, but it's not something that we do when we setup the uart through FDT. Should ACPI behave differently? Is this really a fixup? Either ACPI will setup things differently or we'll change the FDT and ACPI path.

Thanks,

Nikos



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