| Message ID | 20200127200156.15173-13-mrjoel@lixil.net |
|---|---|
| State | Superseded |
| Headers | show |
| Series | ClearFog Base static variant support | expand |
Hi Joel, On Mon, Jan 27, 2020 at 01:01:56PM -0700, Joel Johnson wrote: > Switch to explicitly using the Pro variant DT, which has been > available since Linux 4.11. > > --- > > v4 changes: > - new > v5 changes: > - none > > I separated out this change to the end of the series since it drew > questioning on prior review. I'd still advocate for making the change, > since especially with the additions of static variants and runtime > detection, it becomes easier from within a booted kernel to identify the > type and version of U-Boot image installed. Without making this change, > it becomes less direct to determine an actual Pro vs. Base, vs old > U-Boot image maybe supporting some hybrid variant configuration. > > Even in the Linux kernel adding of the Pro DTS, it is indicated that it > was meant for backwards compatibility. > > Except for cases where checking is done directly against the product > name from userspace, I don't see downsides even from a compatibility > perspective for not making this change. In cases where checking *is* > done from userspace, the broadening of the Clearfog product line would > seem to mean that userspace checking should be flagged as needing to be > udpated as well (or glob/regex matched as needed). One downside I see is that boot of kernels older than 4.11 will fail. But maybe since we already assume a newer kernel for armada-388-clearfog-base.dtb we can do that for -pro as well. By the way, does env_set() override the stored environment? baruch > > Signed-off-by: Joel Johnson <mrjoel at lixil.net> > --- > board/solidrun/clearfog/clearfog.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/board/solidrun/clearfog/clearfog.c b/board/solidrun/clearfog/clearfog.c > index 4170fd4775..c31cfcb242 100644 > --- a/board/solidrun/clearfog/clearfog.c > +++ b/board/solidrun/clearfog/clearfog.c > @@ -238,7 +238,7 @@ int board_late_init(void) > else if (IS_ENABLED(CONFIG_TARGET_CLEARFOG_BASE)) > env_set("fdtfile", "armada-388-clearfog-base.dtb"); > else > - env_set("fdtfile", "armada-388-clearfog.dtb"); > + env_set("fdtfile", "armada-388-clearfog-pro.dtb"); > > return 0; > }
On 2020-01-27 23:17, Baruch Siach wrote: > Hi Joel, > > On Mon, Jan 27, 2020 at 01:01:56PM -0700, Joel Johnson wrote: >> Switch to explicitly using the Pro variant DT, which has been >> available since Linux 4.11. >> >> --- >> >> v4 changes: >> - new >> v5 changes: >> - none >> >> I separated out this change to the end of the series since it drew >> questioning on prior review. I'd still advocate for making the change, >> since especially with the additions of static variants and runtime >> detection, it becomes easier from within a booted kernel to identify >> the >> type and version of U-Boot image installed. Without making this >> change, >> it becomes less direct to determine an actual Pro vs. Base, vs old >> U-Boot image maybe supporting some hybrid variant configuration. >> >> Even in the Linux kernel adding of the Pro DTS, it is indicated that >> it >> was meant for backwards compatibility. >> >> Except for cases where checking is done directly against the product >> name from userspace, I don't see downsides even from a compatibility >> perspective for not making this change. In cases where checking *is* >> done from userspace, the broadening of the Clearfog product line would >> seem to mean that userspace checking should be flagged as needing to >> be >> udpated as well (or glob/regex matched as needed). > > One downside I see is that boot of kernels older than 4.11 will fail. > But > maybe since we already assume a newer kernel for > armada-388-clearfog-base.dtb > we can do that for -pro as well. Older kernels is one case, and to be fair there may also be the case of custom images with a newer kernel that for whatever reason (old file glob patterns) don't ship the -pro.dtb file. My testing focused primarily on OpenWRT and Debian, and while certainly not pervasive, I've also tested with current Armbian and Arch Linux ARM builds. > By the way, does env_set() override the stored environment? I'm not entirely sure of the behavior with duplicate entries, however patch 7 in the series removes the fdtfile entry from being added via CONFIG_EXTRA_ENV_SETTINGS, so it is now only set in one consistent location within board_late_init(). Joel
On 27.01.20 21:01, Joel Johnson wrote: > Switch to explicitly using the Pro variant DT, which has been > available since Linux 4.11. > > --- > > v4 changes: > - new > v5 changes: > - none > > I separated out this change to the end of the series since it drew > questioning on prior review. I'd still advocate for making the change, > since especially with the additions of static variants and runtime > detection, it becomes easier from within a booted kernel to identify the > type and version of U-Boot image installed. Without making this change, > it becomes less direct to determine an actual Pro vs. Base, vs old > U-Boot image maybe supporting some hybrid variant configuration. > > Even in the Linux kernel adding of the Pro DTS, it is indicated that it > was meant for backwards compatibility. > > Except for cases where checking is done directly against the product > name from userspace, I don't see downsides even from a compatibility > perspective for not making this change. In cases where checking *is* > done from userspace, the broadening of the Clearfog product line would > seem to mean that userspace checking should be flagged as needing to be > udpated as well (or glob/regex matched as needed). > > Signed-off-by: Joel Johnson <mrjoel at lixil.net> Again, please make sure to put the S-o-b line above the first "---" line. Other that that: Reviewed-by: Stefan Roese <sr at denx.de> Thanks, Stefan
diff --git a/board/solidrun/clearfog/clearfog.c b/board/solidrun/clearfog/clearfog.c index 4170fd4775..c31cfcb242 100644 --- a/board/solidrun/clearfog/clearfog.c +++ b/board/solidrun/clearfog/clearfog.c @@ -238,7 +238,7 @@ int board_late_init(void) else if (IS_ENABLED(CONFIG_TARGET_CLEARFOG_BASE)) env_set("fdtfile", "armada-388-clearfog-base.dtb"); else - env_set("fdtfile", "armada-388-clearfog.dtb"); + env_set("fdtfile", "armada-388-clearfog-pro.dtb"); return 0; }
Switch to explicitly using the Pro variant DT, which has been available since Linux 4.11. --- v4 changes: - new v5 changes: - none I separated out this change to the end of the series since it drew questioning on prior review. I'd still advocate for making the change, since especially with the additions of static variants and runtime detection, it becomes easier from within a booted kernel to identify the type and version of U-Boot image installed. Without making this change, it becomes less direct to determine an actual Pro vs. Base, vs old U-Boot image maybe supporting some hybrid variant configuration. Even in the Linux kernel adding of the Pro DTS, it is indicated that it was meant for backwards compatibility. Except for cases where checking is done directly against the product name from userspace, I don't see downsides even from a compatibility perspective for not making this change. In cases where checking *is* done from userspace, the broadening of the Clearfog product line would seem to mean that userspace checking should be flagged as needing to be udpated as well (or glob/regex matched as needed). Signed-off-by: Joel Johnson <mrjoel at lixil.net> --- board/solidrun/clearfog/clearfog.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)