[PATCH] configs: rpi: set NR_DRAM_BANKS to four

[PATCH] configs: rpi: set NR_DRAM_BANKS to four

[matthias.bgg at kernel.org]

From: Matthias Brugger <mbrugger@suse.com>

With the new RPi4 which has 8 GB of RAM, we can have up to four DRAM
banks. Bump up the configuration files to detect all the memory in
U-Boot.

Signed-off-by: Matthias Brugger <mbrugger@suse.com>
---
 configs/rpi_4_32b_defconfig | 2 +-
 configs/rpi_4_defconfig     | 2 +-
 configs/rpi_arm64_defconfig | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/configs/rpi_4_32b_defconfig b/configs/rpi_4_32b_defconfig
index b22316cbcb..f369bb93bd 100644
--- a/configs/rpi_4_32b_defconfig
+++ b/configs/rpi_4_32b_defconfig
@@ -4,7 +4,7 @@ CONFIG_SYS_TEXT_BASE=0x00008000
 CONFIG_TARGET_RPI_4_32B=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_ENV_SIZE=0x4000
-CONFIG_NR_DRAM_BANKS=2
+CONFIG_NR_DRAM_BANKS=4
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_ARCH_FIXUP_FDT_MEMORY=y
diff --git a/configs/rpi_4_defconfig b/configs/rpi_4_defconfig
index 165e166bbd..9b90790f06 100644
--- a/configs/rpi_4_defconfig
+++ b/configs/rpi_4_defconfig
@@ -4,7 +4,7 @@ CONFIG_SYS_TEXT_BASE=0x00080000
 CONFIG_TARGET_RPI_4=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_ENV_SIZE=0x4000
-CONFIG_NR_DRAM_BANKS=2
+CONFIG_NR_DRAM_BANKS=4
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_ARCH_FIXUP_FDT_MEMORY=y
diff --git a/configs/rpi_arm64_defconfig b/configs/rpi_arm64_defconfig
index 0cc4efad70..db375eeba7 100644
--- a/configs/rpi_arm64_defconfig
+++ b/configs/rpi_arm64_defconfig
@@ -4,7 +4,7 @@ CONFIG_SYS_TEXT_BASE=0x00080000
 CONFIG_TARGET_RPI_ARM64=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_ENV_SIZE=0x4000
-CONFIG_NR_DRAM_BANKS=2
+CONFIG_NR_DRAM_BANKS=4
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_USE_PREBOOT=y
-- 
2.26.2

CONFIG_NR_DRAM_BANKS in configs/rpi_4* deleted

[Matthias Brugger]

Hi Tom,

I just realized that
88bd5b1793 ("configs: Resync with savedefconfig")

Delete the CONFIG_NR_DRAM_BANKS entries as added in this patch, which leads to a 
regression in RPi4 (only one GB of memory visible to the kernel if you use Grub 
for booting).

Is it generally wrong to add CONFIG_NR_DRAM_BANKS to the config files? What is 
the correct approach then?

Regards,
Matthias

On 29/05/2020 16:42, matthias.bgg at kernel.org wrote:
> From: Matthias Brugger <mbrugger@suse.com>
> 
> With the new RPi4 which has 8 GB of RAM, we can have up to four DRAM
> banks. Bump up the configuration files to detect all the memory in
> U-Boot.
> 
> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
> ---
>   configs/rpi_4_32b_defconfig | 2 +-
>   configs/rpi_4_defconfig     | 2 +-
>   configs/rpi_arm64_defconfig | 2 +-
>   3 files changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/configs/rpi_4_32b_defconfig b/configs/rpi_4_32b_defconfig
> index b22316cbcb..f369bb93bd 100644
> --- a/configs/rpi_4_32b_defconfig
> +++ b/configs/rpi_4_32b_defconfig
> @@ -4,7 +4,7 @@ CONFIG_SYS_TEXT_BASE=0x00008000
>   CONFIG_TARGET_RPI_4_32B=y
>   CONFIG_SYS_MALLOC_F_LEN=0x2000
>   CONFIG_ENV_SIZE=0x4000
> -CONFIG_NR_DRAM_BANKS=2
> +CONFIG_NR_DRAM_BANKS=4
>   CONFIG_DISTRO_DEFAULTS=y
>   CONFIG_OF_BOARD_SETUP=y
>   CONFIG_ARCH_FIXUP_FDT_MEMORY=y
> diff --git a/configs/rpi_4_defconfig b/configs/rpi_4_defconfig
> index 165e166bbd..9b90790f06 100644
> --- a/configs/rpi_4_defconfig
> +++ b/configs/rpi_4_defconfig
> @@ -4,7 +4,7 @@ CONFIG_SYS_TEXT_BASE=0x00080000
>   CONFIG_TARGET_RPI_4=y
>   CONFIG_SYS_MALLOC_F_LEN=0x2000
>   CONFIG_ENV_SIZE=0x4000
> -CONFIG_NR_DRAM_BANKS=2
> +CONFIG_NR_DRAM_BANKS=4
>   CONFIG_DISTRO_DEFAULTS=y
>   CONFIG_OF_BOARD_SETUP=y
>   CONFIG_ARCH_FIXUP_FDT_MEMORY=y
> diff --git a/configs/rpi_arm64_defconfig b/configs/rpi_arm64_defconfig
> index 0cc4efad70..db375eeba7 100644
> --- a/configs/rpi_arm64_defconfig
> +++ b/configs/rpi_arm64_defconfig
> @@ -4,7 +4,7 @@ CONFIG_SYS_TEXT_BASE=0x00080000
>   CONFIG_TARGET_RPI_ARM64=y
>   CONFIG_SYS_MALLOC_F_LEN=0x2000
>   CONFIG_ENV_SIZE=0x4000
> -CONFIG_NR_DRAM_BANKS=2
> +CONFIG_NR_DRAM_BANKS=4
>   CONFIG_DISTRO_DEFAULTS=y
>   CONFIG_OF_BOARD_SETUP=y
>   CONFIG_USE_PREBOOT=y
> 

CONFIG_NR_DRAM_BANKS in configs/rpi_4* deleted

[Tom Rini]

On Wed, Jul 08, 2020 at 05:21:59PM +0200, Matthias Brugger wrote:

> Hi Tom,
> 
> I just realized that
> 88bd5b1793 ("configs: Resync with savedefconfig")
> 
> Delete the CONFIG_NR_DRAM_BANKS entries as added in this patch, which leads
> to a regression in RPi4 (only one GB of memory visible to the kernel if you
> use Grub for booting).
> 
> Is it generally wrong to add CONFIG_NR_DRAM_BANKS to the config files? What
> is the correct approach then?

So, if savedefconfig removes an entry from the file, it's not  needed.
In this case we see:
config NR_DRAM_BANKS
        int "Number of DRAM banks"
        default 1 if ARCH_SUNXI || ARCH_OWL
        default 4
        help
          This defines the number of DRAM banks.

In the top-level Kconfig file.  Since you set it as 4 and 4 is the
default, that's what's used:
$ make O=/tmp/rpi_4 rpi_4_config -sj
$ grep NR_D /tmp/rpi_4/.config
CONFIG_NR_DRAM_BANKS=4
$ grep ARCH_FIX /tmp/rpi_4/.config
CONFIG_ARCH_FIXUP_FDT_MEMORY=y

-- 
Tom
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