In QEMU function build_spcr():
/* Flow Control */
build_append_int_noprefix(table_data, f->flow_control, 1);
/* Language */
build_append_int_noprefix(table_data, f->language, 1);
/* Terminal Type */
build_append_int_noprefix(table_data, f->terminal_type, 1);
/* PCI Device ID */
build_append_int_noprefix(table_data, f->pci_device_id, 2);
Here the sequence of language and terminal_type is swapped compared to
the standard. Only RISC-V and LoongArch set terminal_type != 0. This is
probably why this went unnoticed.
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https://bugs.launchpad.net/bugs/2146419
Title:
QEMU/FWTS: SPCR Language field must be zero, got 0x03 instead
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