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The original AST2600 PCIe design supported both RC_L and RC_H, using root bus number 0 for RC_L and 0x80 for RC_H. In that model, the root port appeared as 80:08.0 and QEMU carried a "bus-nr" property plus a config-space bus remap to translate bus 0x80 to bus 0x00 for PCI enumeration. Linux mainline has since dropped RC_L support and updated the RC_H root bus number to start at 0. The root port is now enumerated as 00:08.0, matching the default QEMU PCIe subsystem root bus numbering. Remove the bus number setting and the AST2600 bus remap logic, and drop the corresponding "bus-nr"/rc_bus_nr fields and property plumbing. QEMU now relies on the default root bus 0 behavior. Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Link: https://lore.kernel.org/qemu-devel/20260127032348.2238527-4-jamin_lin@aspeedtech.com Signed-off-by: Cédric Le Goater <clg@redhat.com>