I am using u-boot version 1.1.3, kernel, Linux(Debian) is version 2.6.12. I searched through the kernel configuration options via menuconfig, i could not find anything that configures the number of serial ports. In LINUX, i tried creating ttyS1 with "mknod -m 660 /dev/ttS1 c 4 65". A /dev/ttyS1 shows up in the directory listing, but I am unable to transmit/receive characters on it.
Thanks.
Scott Wood-2 wrote:
On Tue, Aug 25, 2009 at 08:37:11AM -0700, AGKohler wrote:
Hello,
I am working with a mpc8260ads(actually QUICC 8248 processor) based board. There are two hardware rs-232 ports available. I can switch the console between the two by switching the CONFIG_CONS_INDEX configuration variable between 1 and 4. I would like to have both ports in service, when Linux comes up. One as the console and the second to communicate with(i.e. acquire data from) a third party rs-232 device. Eventually, the third party device may be a telephone modem. Can anyone explain how to accomplish this, and if not, what constraints are blocking the accomplishment of my requirements. Any suggestions will be appreciated.
This isn't a U-Boot issue, except insofar as U-Boot passes a device tree to Linux (assuming it does even that -- you don't mention which kernel or u-boot version you're using).
If your device tree contains both serial ports, then Linux should be able to use them both. If it doesn't work, make sure all the pins are configured correctly, typically by Linux platform code for your board (though ideally U-Boot should set them up as well).
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