On Mon, Dec 23, 2024 at 08:51:42PM +0900, Kunihiko Hayashi wrote: > On 2024/12/19 22:08, Niklas Cassel wrote: > > On Thu, Dec 19, 2024 at 08:17:50PM +0900, Kunihiko Hayashi wrote: > > > On 2024/12/17 17:19, Niklas Cassel wrote: [...] > On the other hand, some other SoCs might have BAR masks fixed by the DWC > IP configuration. These BARs will be exposed to the host even if the BAR > mask is set to 0. However, such case hasn't been upstreamed, so there is > no need to worry about them now. The three schemes are: BARn_SIZING_SCHEME_N =“Fixed Mask” (0) BARn_SIZING_SCHEME_N =“Programmable Mask” (1) BARn_SIZING_SCHEME_N =“Resizable BAR” (2) Considering that the text: "To disable a BAR (in any of the three schemes), your application can write ‘0’ to the LSB of the BAR mask register." says "in any of the three schemes", I would expect writing 0 to BAR_MASK should disable a BAR, even for a Fixed Mask/Fixed BAR. Kind regards, Niklas
