rtl8139: Fix invalid IO access alignment
This patch makes iPXE work with the rtl8139 emulation. The rtl8139 driver in iPXE issues a 16bit access on the ChipCmd register (offset 0x37) to check the status of the rx buffer. The offset of the ioport access was getting fixed up to 0x36 in qemu, causing the value read in iPXE to be invalid. This fixes an issue with iPXE reporting timeouts during TFTP transfers. Reposting this here because it is trivial enough and the original post on qemu-devel didn't attract much attention. Also, the inw() which was causing the issue has been replaced with an inb() in upstream iPXE: https://git.ipxe.org/ipxe.git/commit/91dd64ad25baa27954a7518e73df4fca8a2d0c93Signed-off-by: NJulian Pidancet <julian.pidancet@gmail.com> Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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