Am 21.10.2016 um 17:24 schrieb Stefan Wahren: > Am 21.10.2016 um 17:03 schrieb Shawn Guo: >> On Fri, Oct 21, 2016 at 04:05:59PM +0200, Stefan Wahren wrote: >>> Am 21.10.2016 um 15:53 schrieb Shawn Guo: >>>> On Tue, Sep 13, 2016 at 05:51:02PM +0000, Stefan Wahren wrote: >>>>> The i.MX23 / i.MX28 have a small amount of On-Chip RAM which is also necessary >>>>> for suspend to RAM and standby mode. But before we need to remove the fake reg >>>>> properties of all internal bus nodes as discussed in this thread [1]. >>>>> >>>>> This patch series requires Fabio Estevam's recent series "ARM: dts: imx23: >>>>> Remove skeleton.dtsi inclusion" [2]. >>>>> >>>>> [1] - https://marc.info/?l=devicetree&m=146139948426520&w=2 >>>> The page cannot be reached. I would like to understand the >>>> background for this change. >>> Strange, because i don't have any problems while clicking on the URL. >>> >>> It's an older discussion on the devicetree / kernel newbie mailing list >>> with subject "strange dtc errors after adding sram node". Arnd suggested >>> in the discussion to remove the reg property from the ahb node. >>> >>> Please try this one: http://www.spinics.net/lists/newbies/msg57652.html >> If you go through 'Table 4-1. Address Map for i.MX28' of MCIMX28RM, you >> should be able to find there are 3 AHB buses: ahb@0, ahb@80080000 and >> ahb@c0000000. The ocram goes to ahb@0. The following change should be >> the right one for ocram addition. > Correct me if i'm wrong, but there is only one AHB bus and only the > connected peripheral devices like ocram or USB controller have a memory > mapped start address not the bus itself. Please forget about that. According to the reference manual there are 3 AHB bus layers. > >> diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi >> index 0ad893bf5f43..8e5718df06b2 100644 >> --- a/arch/arm/boot/dts/imx28.dtsi >> +++ b/arch/arm/boot/dts/imx28.dtsi >> @@ -47,6 +47,19 @@ >> }; >> }; >> >> + ahb@0 { >> + compatible = "simple-bus"; >> + #address-cells = <1>; >> + #size-cells = <1>; >> + reg = <0x0 0x80000000>; >> + ranges; >> + >> + ocram: sram@0 { >> + compatible = "mmio-sram"; >> + reg = <0x0 0x20000>; >> + }; >> + }; >> + >> apb@80000000 { >> compatible = "simple-bus"; >> #address-cells = <1>; >> > -- Software-Entwickler / software developer I2SE GmbH Tel: +49 (0) 341 355667-00 Friedrich-Ebert-Str. 61 Fax: +49 (0) 341 355667-02 04109 Leipzig Germany Web: http://www.i2se.com/ Mail: info@xxxxxxxx VAT No.: DE 811528334 Amtsgericht Leipzig HRB 23784 Geschäftsführer/CEO: Carsten Ziermann *** Diese E-Mail ist allein für den bezeichneten Adressaten bestimmt. Sie kann rechtlich vertrauliche Informationen enthalten. Wenn Sie diese E-Mail irrtümlich erhalten haben, informieren Sie bitte unverzüglich den Absender per E-Mail und löschen Sie diese E-Mail von Ihrem Computer, ohne Kopien anzufertigen. Vielen Dank. *** *** This email is for the exclusive use of the addressee. It may contain legally privileged information. If you have received this message in error, please notify the sender by email immediately and delete the message from your computer without making any copies. Thank you. *** -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
