>> Newer kernels support dynamically allocating this parameter RAM. Older >> kernels use whatever u-boot chose.
I see. Thanks . U-boot initialize SMC1 for the first time, and has set SMC1_BASE to the 0x87FC offset of the DPRAM. kernel 2.6.25 initialize SMC1 for the second time as well as which are done in u-boot, except to set SMC1_BASE again. So if SMC1_BASE is transferred to kernel by dts correctly, SMC1 should work well. The problem must be my dts file ,not the code. ----- Original Message ----- From: "hellohello" <hellohello...@163.com> To: "Scott Wood" <scottw...@freescale.com> Cc: <linuxppc-dev@lists.ozlabs.org> Sent: Saturday, May 22, 2010 10:51 AM Subject: Re: Problem of PowerPc 82xx when using smc > >> Newer kernels support dynamically allocating this parameter RAM. Older >> kernels use whatever u-boot chose. >> >> Why do you want to set it to a particular address? > > There should be some code to set SMC1_BASE to the 0x87FC offset of the DPRAM, > whatever SMC1_BASE is fixed or dynamically allocated . > > My kernel is 2.6.25, this SMC1_BASE value can be transferred to kernel by > dts tree, but I have not find the code to set it to 0x87FC offset of the > DPRAM. Or there is another way to solve it ? > > > > ----- Original Message ----- > From: "Scott Wood" <scottw...@freescale.com> > To: "hellohello" <hellohello...@163.com> > Cc: <linuxppc-dev@lists.ozlabs.org> > Sent: Saturday, May 22, 2010 1:28 AM > Subject: Re: Problem of PowerPc 82xx when using smc > > >> On 05/20/2010 10:33 PM, hellohello wrote: >>>> No, it shouldn't -- rx_bd_base is of type "cbd_t *", so the multiplication >>>> already happens as part of pointer arithmetic. >>> ---Yes, you are right. I made a basic mistake. >>> >>> But now I have another question. >>> The SMC1 params can be relocated to any offset of the DPRAM on a 64 byte >>> boundary, not as the SCC1, which must be at 0x8000 offset of the DPRAM. >>> The SMC1 params base is set at 0x87FC offset of the DPRAM. >>> >>> So if I want SMC1 params start at 0x200 in DPRAM , I should set 0x200 to >>> the 0x87FC offset of the DPRAM. >>> I have see this code in u-boot, but I can not find this code in neither >>> cpm_uart_cpm2.c nor cpm_uart_core.c. >>> >>> Should I add these code to cpm_uart_core.c? >> >> Newer kernels support dynamically allocating this parameter RAM. Older >> kernels use whatever u-boot chose. >> >> Why do you want to set it to a particular address? >> >> -Scott >> _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
