On Friday, February 26, 2016, <[email protected]> wrote: > Hi, > > On 16-02-26 00:55:40, Woody Wu wrote: > > Hi, > > > > It seems, at least in 4.4.2 kernel, earlyprintk parameter supports > > something like 's3c24xx,<addr>'. But I dont know where to find out the > addr > > value of the first uart port on my *s3c2416* based board. Can someone > > please tell me? > > > > Also, I desire to know if the earlycon parameter supports the Samsung > > S3C24xx uarts, if so, what should the value of the parameter look like? > > Have a look in the documentation here > https://www.kernel.org/doc/Documentation/kernel-parameters.txt > > The kernels kernel-parameter.txt documentation file lists the supported > drivers. > > Generally the UART0 port is used for debugging but I guess there is > no such hard and fast rule. > > For your particular board, you can check which UART port is used > as the debug serial console and then get the address for the concerned > UART by checking the relevant dtsi file in > arch/arm/boot/dts/s3c24xx.dtsi or perhaps one of the exynosX.dtsi files? > > UART0 port seems to have address of 0x50000000? > > Regards, > Sanchayan.
Thanks for you pointing me to the dtsi files, very informational ! And, yes, the uart0 address os 0x50000000 and I has made it work via 'earlyprintk=serial,0x50000000,115200'. By the way, is this a physical address or mmap-ed address? > > > > > Thank in advance, > > > > -woody > > > > > > -- > > Life is the only flaw in an otherwise perfect nonexistence > > -- Schopenhauer > > > > woody > > public key at http://subkeys.pgp.net:11371 ([email protected] > <javascript:;>) > > > _______________________________________________ > > Kernelnewbies mailing list > > [email protected] <javascript:;> > > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > -- Life is the only flaw in an otherwise perfect nonexistence -- Schopenhauer woody public key at http://subkeys.pgp.net:11371 ([email protected])
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