[PATCH] arm64: Default to 4K translation granule

[PATCH] arm64: Default to 4K translation granule

[Oliver Upton]

Some arm64 implementations in the wild, like the Apple parts, do not
support the 64K translation granule. This can be a bit annoying when
running with the defaults on such hardware, as every test fails
before getting the MMU turned on.

Switch the default page size to 4K with the intention of having the
default setting be the most widely applicable one.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
---
 configure | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/configure b/configure
index 49f047cb2d7d..4ac2ff3e6106 100755
--- a/configure
+++ b/configure
@@ -75,7 +75,7 @@ usage() {
 	                           (s390x only)
 	    --page-size=PAGE_SIZE
 	                           Specify the page size (translation granule) (4k, 16k or
-	                           64k, default is 64k, arm64 only)
+	                           64k, default is 4k, arm64 only)
 	    --earlycon=EARLYCON
 	                           Specify the UART name, type and address (optional, arm and
 	                           arm64 only). The specified address will overwrite the UART
@@ -243,11 +243,7 @@ if [ "$efi" ] && [ "$arch" = "riscv64" ] && [ -z "$efi_direct" ]; then
 fi
 
 if [ -z "$page_size" ]; then
-    if [ "$efi" = 'y' ] && [ "$arch" = "arm64" ]; then
-        page_size="4096"
-    elif [ "$arch" = "arm64" ]; then
-        page_size="65536"
-    elif [ "$arch" = "arm" ]; then
+    if [ "$arch" = "arm" ] || [ "$arch" = "arm64" ]; then
         page_size="4096"
     fi
 else
-- 
2.45.0.rc1.225.g2a3ae87e7f-goog

Re: [PATCH] arm64: Default to 4K translation granule

[Oliver Upton]

disregard -- forgot I didn't have my subject prefix config set on this
machine.

On Thu, May 02, 2024 at 07:39:18AM +0000, Oliver Upton wrote:
> Some arm64 implementations in the wild, like the Apple parts, do not
> support the 64K translation granule. This can be a bit annoying when
> running with the defaults on such hardware, as every test fails
> before getting the MMU turned on.
> 
> Switch the default page size to 4K with the intention of having the
> default setting be the most widely applicable one.
> 
> Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
> ---
>  configure | 8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/configure b/configure
> index 49f047cb2d7d..4ac2ff3e6106 100755
> --- a/configure
> +++ b/configure
> @@ -75,7 +75,7 @@ usage() {
>  	                           (s390x only)
>  	    --page-size=PAGE_SIZE
>  	                           Specify the page size (translation granule) (4k, 16k or
> -	                           64k, default is 64k, arm64 only)
> +	                           64k, default is 4k, arm64 only)
>  	    --earlycon=EARLYCON
>  	                           Specify the UART name, type and address (optional, arm and
>  	                           arm64 only). The specified address will overwrite the UART
> @@ -243,11 +243,7 @@ if [ "$efi" ] && [ "$arch" = "riscv64" ] && [ -z "$efi_direct" ]; then
>  fi
>  
>  if [ -z "$page_size" ]; then
> -    if [ "$efi" = 'y' ] && [ "$arch" = "arm64" ]; then
> -        page_size="4096"
> -    elif [ "$arch" = "arm64" ]; then
> -        page_size="65536"
> -    elif [ "$arch" = "arm" ]; then
> +    if [ "$arch" = "arm" ] || [ "$arch" = "arm64" ]; then
>          page_size="4096"
>      fi
>  else
> -- 
> 2.45.0.rc1.225.g2a3ae87e7f-goog
> 

-- 
Thanks,
Oliver