Re: [U-Boot] ATAGS for Tegra, Sunxi, etc.
On Thu, 2015-12-17 at 09:44 -0700, Stephen Warren wrote: > IIRC, Tegra support in U-Boot was added in the days before DT was a > thing, or a widespread thing at least. (Oh, happy days!) I imagine > that > the config option was simply never removed since there was no > specific > need to do so. Please remember that at least for T20 and T30 NVIDIA's officially supported Linux for Tegra (L4T) is still based on the ancient Linux kernel 3.1.10 relying on ATAGs. While Colibri T20 and Apalis/Colibri T30 are mainline since a while there is still no solution for hardware accelerated graphics/multimedia compatible with mainline as far as I know. So for hardware accelerated graphics/multimedia one is pretty much stuck with L4T requiring ATAGs! ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] ATAGS for Tegra, Sunxi, etc.
Hi everyone, Thanks for explanation! Keeping ATAGS makes sense for combination of new U-Boot and old Linux. -- Best Regards Masahiro Yamada ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] ATAGS for Tegra, Sunxi, etc.
Hi, On 17-12-15 10:21, Ian Campbell wrote: On Thu, 2015-12-17 at 07:40 +0100, Karsten Merker wrote: On Thu, Dec 17, 2015 at 01:59:57PM +0900, Masahiro Yamada wrote: 2015-12-17 13:58 GMT+09:00 Masahiro Yamada: Hi, I noticed some well-maintained new SoC families still define CONFIG_CMDLINE_TAG. For example, [...] include/configs/sunxi-common.h #define CONFIG_SETUP_MEMORY_TAGS #define CONFIG_CMDLINE_TAG #define CONFIG_INITRD_TAG #define CONFIG_SERIAL_TAG Do they still use ATAGS, not device tree? Sunxi uses devicetree for mainline kernels, but AFAIK ATAG support is necessary to enable booting legacy vendor kernels. There is still new sunxi-based hardware sold today that comes with legacy 3.4-based kernels. That legacy kernel is FEX (allwinners own description blob) based, I don't know to what extent that involves ATAGs in some way though. There are also people who use the 3.4 based fork from linux-sunxi.org, but I don't know if that is DT or ATAGS or FEX. A dependency on CONFIG_OLD_SUNXI_KERNEL_COMPAT might be an option depending on what the kernels need, Hans probably knows better than I do. The 3.4 based kernels use both ATAGS for things like memory size, and fex for other hw config info. I'm not in favor of wrapping things in CONFIG_OLD_SUNXI_KERNEL_COMPAT, because recent 3.4 based kernels can boot without that, and I believe that removing the ATAG support will break this, without really buying us much. Regards, Hans ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] ATAGS for Tegra, Sunxi, etc.
On Thu, 2015-12-17 at 07:40 +0100, Karsten Merker wrote: > On Thu, Dec 17, 2015 at 01:59:57PM +0900, Masahiro Yamada wrote: > > 2015-12-17 13:58 GMT+09:00 Masahiro Yamada> om>: > > > Hi, > > > > > > I noticed some well-maintained new SoC families still > > > define CONFIG_CMDLINE_TAG. > > > > > > > > > For example, > [...] > > > include/configs/sunxi-common.h > > > > > > #define CONFIG_SETUP_MEMORY_TAGS > > > #define CONFIG_CMDLINE_TAG > > > #define CONFIG_INITRD_TAG > > > #define CONFIG_SERIAL_TAG > > > > Do they still use ATAGS, not device tree? > > Sunxi uses devicetree for mainline kernels, but AFAIK ATAG > support is necessary to enable booting legacy vendor kernels. > There is still new sunxi-based hardware sold today that comes > with legacy 3.4-based kernels. That legacy kernel is FEX (allwinners own description blob) based, I don't know to what extent that involves ATAGs in some way though. There are also people who use the 3.4 based fork from linux-sunxi.org, but I don't know if that is DT or ATAGS or FEX. A dependency on CONFIG_OLD_SUNXI_KERNEL_COMPAT might be an option depending on what the kernels need, Hans probably knows better than I do. Ian. > CCing Hans de Goede and Ian Cambell (sunxi maintainers). > > Regards, > Karsten ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] ATAGS for Tegra, Sunxi, etc.
On Thu, Dec 17, 2015 at 10:26:07AM +0100, Hans de Goede wrote: > Hi, > > On 17-12-15 10:21, Ian Campbell wrote: > >On Thu, 2015-12-17 at 07:40 +0100, Karsten Merker wrote: > >>On Thu, Dec 17, 2015 at 01:59:57PM +0900, Masahiro Yamada wrote: > >>>2015-12-17 13:58 GMT+09:00 Masahiro Yamada>>>om>: > Hi, > > I noticed some well-maintained new SoC families still > define CONFIG_CMDLINE_TAG. > > > For example, > >>[...] > include/configs/sunxi-common.h > > #define CONFIG_SETUP_MEMORY_TAGS > #define CONFIG_CMDLINE_TAG > #define CONFIG_INITRD_TAG > #define CONFIG_SERIAL_TAG > >> > Do they still use ATAGS, not device tree? > >> > >>Sunxi uses devicetree for mainline kernels, but AFAIK ATAG > >>support is necessary to enable booting legacy vendor kernels. > >>There is still new sunxi-based hardware sold today that comes > >>with legacy 3.4-based kernels. > > > >That legacy kernel is FEX (allwinners own description blob) based, I don't > >know to what extent that involves ATAGs in some way though. > > > >There are also people who use the 3.4 based fork from linux-sunxi.org, but > >I don't know if that is DT or ATAGS or FEX. > > > >A dependency on CONFIG_OLD_SUNXI_KERNEL_COMPAT might be an option depending > >on what the kernels need, Hans probably knows better than I do. > > The 3.4 based kernels use both ATAGS for things like memory size, and fex > for other hw config info. > > I'm not in favor of wrapping things in CONFIG_OLD_SUNXI_KERNEL_COMPAT, because > recent 3.4 based kernels can boot without that, and I believe that removing > the ATAG support will break this, without really buying us much. +1. ATAG is also used iirc for some other operating systems, still. -- Tom signature.asc Description: Digital signature ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] ATAGS for Tegra, Sunxi, etc.
On 12/16/2015 09:59 PM, Masahiro Yamada wrote: + To: U-Boot ML I forgot to send this to ML. 2015-12-17 13:58 GMT+09:00 Masahiro Yamada: Hi, I noticed some well-maintained new SoC families still define CONFIG_CMDLINE_TAG. For example, include/configs/tegra-common.h #define CONFIG_CMDLINE_TAG /* enable passing of ATAGs */ IIRC, Tegra support in U-Boot was added in the days before DT was a thing, or a widespread thing at least. (Oh, happy days!) I imagine that the config option was simply never removed since there was no specific need to do so. ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] ATAGS for Tegra, Sunxi, etc.
+ To: U-Boot ML I forgot to send this to ML. 2015-12-17 13:58 GMT+09:00 Masahiro Yamada: > Hi, > > I noticed some well-maintained new SoC families still > define CONFIG_CMDLINE_TAG. > > > For example, > > include/configs/tegra-common.h > > #define CONFIG_CMDLINE_TAG /* enable passing of ATAGs */ > > > > include/configs/sunxi-common.h > > #define CONFIG_SETUP_MEMORY_TAGS > #define CONFIG_CMDLINE_TAG > #define CONFIG_INITRD_TAG > #define CONFIG_SERIAL_TAG > > > > Do they still use ATAGS, not device tree? > > > > -- > Best Regards > Masahiro Yamada -- Best Regards Masahiro Yamada ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot