On the ARM virt machine, there is currently no way to programmatically
discover the frequency of the UART reference clock solely through the use of
UEFI/ACPI (without the DTB). The SPCR table can include this information
as of revision 3.
Bump the revision to 3 and add the clock frequency of 24 MHz to the table.
Signed-off-by: Vadim Chichikalyuk <chichikal...@gmail.com>
---
hw/arm/virt-acpi-build.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/hw/arm/virt-acpi-build.c b/hw/arm/virt-acpi-build.c
index b01fc4f8ef..029cbb37f7 100644
--- a/hw/arm/virt-acpi-build.c
+++ b/hw/arm/virt-acpi-build.c
@@ -559,12 +559,13 @@ spcr_setup(GArray *table_data, BIOSLinker *linker,
VirtMachineState *vms)
.pci_function = 0,
.pci_flags = 0,
.pci_segment = 0,
+ .uart_clk_freq = 24000000, /* 24MHz */
};
/*
- * Passing NULL as the SPCR Table for Revision 2 doesn't support
+ * Passing NULL as the SPCR Table for Revision 3 doesn't support
* NameSpaceString.
*/
- build_spcr(table_data, linker, &serial, 2, vms->oem_id, vms->oem_table_id,
+ build_spcr(table_data, linker, &serial, 3, vms->oem_id, vms->oem_table_id,
NULL);
}
--
2.39.5 (Apple Git-154)
