table_compute_checksum() returns the value that makes the byte sum of
the buffer zero. If the ext_checksum field already contains a non-zero
value (as QEMU's firmware-provided RSDP does), adding that existing
value into the sum produces an incorrect complement. Zero the field
before calling table_compute_checksum() so the calculation starts from
a clean state, matching the pattern used in acpi_write_rsdp().
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Heinrich Schuchardt
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