> -----Original Message----- > From: Marek Vasut [mailto:ma...@denx.de] > Sent: 2016年4月25日 18:30 > To: Yang, Wenyou <wenyou.y...@atmel.com> > Cc: u-boot@lists.denx.de > Subject: Re: SAMA5D2 xplained SD/eMMC boot > > On 04/25/2016 02:55 AM, Yang, Wenyou wrote: > > Hi Marek, > > > >> -----Original Message----- > >> From: Marek Vasut [mailto:ma...@denx.de] > >> Sent: 2016年4月22日 20:18 > >> To: Yang, Wenyou <wenyou.y...@atmel.com> > >> Cc: u-boot@lists.denx.de > >> Subject: Re: SAMA5D2 xplained SD/eMMC boot > >> > >> On 04/22/2016 02:54 AM, Yang, Wenyou wrote: > >>> Hi Marek, > >> > >> Hi! > >> > >>>> -----Original Message----- > >>>> From: Marek Vasut [mailto:ma...@denx.de] > >>>> Sent: 2016年4月21日 10:59 > >>>> To: Yang, Wenyou <wenyou.y...@atmel.com> > >>>> Cc: u-boot@lists.denx.de > >>>> Subject: Re: SAMA5D2 xplained SD/eMMC boot > >>>> > >>>> On 04/21/2016 04:46 AM, Yang, Wenyou wrote: > >>>>> Hi, > >>>> > >>>> Hi! > >>>> > >>>> [...] > >>>> pile of unnecessary email headers redacted. > >>>> [...] > >>>> > >>>>>>>>>>>> Hi! > >>>>>>>>>>>> > >>>>>>>>>>>> I've been playing around with latest mainline u-boot on > >>>>>>>>>>>> sama5d2 xplained ultra. I noticed that if I want to boot > >>>>>>>>>>>> the board from SD card (SDHCI1), the board will indeed load > >>>>>>>>>>>> the SPL from it, but SPL will try to load u-boot.img from > >>>>>>>>>>>> eMMC > >>>>>>>>>>>> (SDHCI0) and fail, as my eMMC is blank. > >>>>>>>>>>> > >>>>>>>>>>> Yes, there is some issue to load u-boot.img. I found there > >>>>>>>>>>> is something to do on > >>>>>>>>>> sdhci.c. > >>>>>>>>>>> > >>>>>>>>>>> You can try this branch, it should works. > >>>>>>>>>>> > >>>>>>>>>>> https://github.com/linux4sam/u-boot-at91/commits/u-boot-2016 > >>>>>>>>>>> .0 > >>>>>>>>>>> 3- > >>>>>>>>>>> at > >>>>>>>>>>> 91 > >>>>>>>>>> > >>>>>>>>>> I am not interested in using non-mainline stuff. Do you have > >>>>>>>>>> any particular patch/commit which I can refer to ? I do not > >>>>>>>>>> think this has anything to do with sdhci.c driver at all, it > >>>>>>>>>> has to do with detecting the boot device from which SPL was > >>>>>>>>>> started and loading u-boot.img from the same boot device > >>>>>>>>>> instead of always using > >>>> SDHCI0. > >>>>>>>>> > >>>>>>>>> I will test the mainline code. I will let you know when I get > >>>>>>>>> something. > >>>>>>>> > >>>>>>>> OK. > >>>>>>>> > >>>>>>>> Does the SoC have any sort of register which lists the current > >>>>>>>> boot > >> device ? > >>>>>>> > >>>>>>> In this SoC, there is not register to list the current boot device. > >>>>>> > >>>>>> And thus, it is not possible to detect at runtime from which > >>>>>> device the SoC booted and thus load u-boot.img from the same device. > Correct ? > >>>>> > >>>>> Yes, > >>>> > >>>> Ha, thanks for confirming. > >>> > >>> Sorry, can I correct what I said yesterday? > >> > >> What if I said "no" ? :-) > >> > >>> There is a register to list the boot information exported by ROMCode. > >>> > >>> The boot information is stored in R4 register when the ROMCode jumps > >>> to the > >> bootstrap. > >> > >> Ha, so the U-Boot SPL can save the r4 register early in the boot and > >> extract the boot device from it. That's neat. Thanks! > >> > >>> Here is the contents definitions R4 on the SAMA5D2 (improved > >>> compared to old > >> MPUs to take care of IOSet features). > >> > >> Is this stuff somewhere in the SAMA5Dx datasheet ? It'd be nice to > >> know/have this information for other SAMA5Dx too (d3 and d4). > > > > It seems it is not included in the in the SAMA5Dx datasheet. > > So where did you get these numbers from ?
Yes, it is not included in the datasheet now. We are not recommend to use them. If it is helpful for you, please reference the previous mail. > > > This feature is available since AT91SAM9G45, inclusive d3 and d4. > > Oh cool, so the numbers are the same for all these chips ? Yes, basically same, only d2 includes additional ioset information. Best Regards, Wenyou Yang _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot