search for: c4fa331

Hi, I would like to point out an issue with the enumeration of ISA serial devices in Syslinux. If I interpret the snippet below correctly, Syslinux looks up the device order with the BIOS, while Linux uses the fixed order 3F8,2F8,3E8,2E8. Note that this inconsistency is a real problem, as some motherboards (like e.g. a Supermicro X10DRi with default BIOS settings) have a different order

On 09.10.2016 14:49, Gene Cumm wrote: > Excellent job digging up the differences. Looks like the code comes > from commit ID c4fa331 but is much older. The code comes from 7916325 > which is derived from the ASM in beaaa4f. It appears to me that it > was used to check the presence of a serial port and it was assumed the > order at that memory address would be consistent and either the proper > value or 0. > >...

...n the port is simply the I/O base address > */ > if (port > 3) > return port; > > /* Get the I/O port from the BIOS */ > return serial_ports[port]; > } > --- Excellent job digging up the differences. Looks like the code comes from commit ID c4fa331 but is much older. The code comes from 7916325 which is derived from the ASM in beaaa4f. It appears to me that it was used to check the presence of a serial port and it was assumed the order at that memory address would be consistent and either the proper value or 0. I'm trying to dig for so...

On Sun, Oct 9, 2016 at 10:04 AM, Oliver Mangold via Syslinux <syslinux at zytor.com> wrote: > On 09.10.2016 14:49, Gene Cumm wrote: >> >> Excellent job digging up the differences. Looks like the code comes >> from commit ID c4fa331 but is much older. The code comes from 7916325 >> which is derived from the ASM in beaaa4f. It appears to me that it >> was used to check the presence of a serial port and it was assumed the >> order at that memory address would be consistent and either the proper >> value...