Hi Claudiu Beznea, > -----Original Message----- > From: Claudiu Beznea <claudiu.beznea@xxxxxxxxx> > Sent: 08 July 2025 11:10 > Subject: Re: [PATCH v3 7/9] arm64: dts: renesas: rzg3s-smarc-som: Update dma-ranges for PCIe > > Hi, Biju, > > On 07.07.2025 11:18, Biju Das wrote: > > Hi Claudiu, > > > >> -----Original Message----- > >> From: Claudiu <claudiu.beznea@xxxxxxxxx> > >> Sent: 04 July 2025 17:14 > >> Subject: [PATCH v3 7/9] arm64: dts: renesas: rzg3s-smarc-som: Update > >> dma-ranges for PCIe > >> > >> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> > >> > >> The first 128MB of memory is reserved on this board for secure area. > >> Update the PCIe dma-ranges property to reflect this. > > > > I see R-Car PCIe dma-ranges[1] and [2] maps all possible DDR area supported by the SoC? > > Do we need to make board specific as well there? > > I'm not familiar with R-Car, but if there are ranges reserved for other purposes, I think we should > reflect it in board specific device trees. Already Linux has this DDR info[1]. Linux provides DMA memory only from this region. In your testing, have you faced any issue like system allocated DMA region other than [1] and you don't want to use it, then the changes are ok?? Not sure, PCIe can work on internal memory such as SRAM? [1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/arch/arm64/boot/dts/renesas/rzg3s-smarc-som.dtsi?h=next-20250708#n31 Cheers, Biju
