mips: cmd: go: Flush cache before jumping to app/image

It has been noticed on MT7628/88 platforms, that booting the RAM image
does not work reliably. Sometimes it works and sometimes not. Debugging
showed that this "might" be a cache related issue as very strange
errors occurred (e.g. output corrupted etc).

This patch adds a cache flush for the complete SDRAM area to the go cmd
before jumping to the entry point for the MIPS architecture. The
complete area is flushed as we don't know at this point, how big the
area of the "application" really is.

Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Mauro Condarelli <mc5686@mclink.it>
Cc: Weijie Gao <weijie.gao@mediatek.com>
---
 arch/mips/lib/Makefile |  1 +
 arch/mips/lib/boot.c   | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 arch/mips/lib/boot.c

Tested on VoCore2 board.
RAM loading seems to work flawlessly.

Tested-by: Mauro Condarelli <mc5686@mclink.it>

Regards
Mauro


On 2/12/20 3:26 PM, Stefan Roese wrote:
> It has been noticed on MT7628/88 platforms, that booting the RAM image
> does not work reliably. Sometimes it works and sometimes not. Debugging
> showed that this "might" be a cache related issue as very strange
> errors occurred (e.g. output corrupted etc).
>
> This patch adds a cache flush for the complete SDRAM area to the go cmd
> before jumping to the entry point for the MIPS architecture. The
> complete area is flushed as we don't know at this point, how big the
> area of the "application" really is.
>
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
> Cc: Mauro Condarelli <mc5686@mclink.it>
> Cc: Weijie Gao <weijie.gao@mediatek.com>
> ---
>  arch/mips/lib/Makefile |  1 +
>  arch/mips/lib/boot.c   | 23 +++++++++++++++++++++++
>  2 files changed, 24 insertions(+)
>  create mode 100644 arch/mips/lib/boot.c
>
> diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
> index 589bc651f9..24a72d9c97 100644
> --- a/arch/mips/lib/Makefile
> +++ b/arch/mips/lib/Makefile
> @@ -11,5 +11,6 @@ obj-y	+= stack.o
>  obj-y	+= traps.o
>  
>  obj-$(CONFIG_CMD_BOOTM) += bootm.o
> +obj-$(CONFIG_CMD_GO) += boot.o
>  
>  lib-$(CONFIG_USE_PRIVATE_LIBGCC) += ashldi3.o ashrdi3.o lshrdi3.o
> diff --git a/arch/mips/lib/boot.c b/arch/mips/lib/boot.c
> new file mode 100644
> index 0000000000..6186f72090
> --- /dev/null
> +++ b/arch/mips/lib/boot.c
> @@ -0,0 +1,23 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2020 Stefan Roese <sr@denx.de>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <cpu_func.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +unsigned long do_go_exec(ulong (*entry)(int, char * const []),
> +			 int argc, char * const argv[])
> +{
> +	/*
> +	 * Flush cache before jumping to application. Let's flush the
> +	 * whole SDRAM area, since we don't know the size of the image
> +	 * that was loaded.
> +	 */
> +	flush_cache(gd->bd->bi_memstart, gd->bd->bi_memsize);
> +
> +	return entry(argc, argv);
> +}

On Wed, Feb 12, 2020 at 3:26 PM Stefan Roese <sr@denx.de> wrote:
>
> It has been noticed on MT7628/88 platforms, that booting the RAM image
> does not work reliably. Sometimes it works and sometimes not. Debugging
> showed that this "might" be a cache related issue as very strange
> errors occurred (e.g. output corrupted etc).
>
> This patch adds a cache flush for the complete SDRAM area to the go cmd
> before jumping to the entry point for the MIPS architecture. The
> complete area is flushed as we don't know at this point, how big the
> area of the "application" really is.
>
> Signed-off-by: Stefan Roese <sr@denx.de>
> Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
> Cc: Mauro Condarelli <mc5686@mclink.it>
> Cc: Weijie Gao <weijie.gao@mediatek.com>
> ---
>  arch/mips/lib/Makefile |  1 +
>  arch/mips/lib/boot.c   | 23 +++++++++++++++++++++++
>  2 files changed, 24 insertions(+)
>  create mode 100644 arch/mips/lib/boot.c
>
> diff --git a/arch/mips/lib/Makefile b/arch/mips/lib/Makefile
> index 589bc651f9..24a72d9c97 100644
> --- a/arch/mips/lib/Makefile
> +++ b/arch/mips/lib/Makefile
> @@ -11,5 +11,6 @@ obj-y += stack.o
>  obj-y  += traps.o
>
>  obj-$(CONFIG_CMD_BOOTM) += bootm.o
> +obj-$(CONFIG_CMD_GO) += boot.o
>
>  lib-$(CONFIG_USE_PRIVATE_LIBGCC) += ashldi3.o ashrdi3.o lshrdi3.o
> diff --git a/arch/mips/lib/boot.c b/arch/mips/lib/boot.c
> new file mode 100644
> index 0000000000..6186f72090
> --- /dev/null
> +++ b/arch/mips/lib/boot.c
> @@ -0,0 +1,23 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2020 Stefan Roese <sr@denx.de>
> + */
> +
> +#include <common.h>
> +#include <command.h>
> +#include <cpu_func.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +unsigned long do_go_exec(ulong (*entry)(int, char * const []),
> +                        int argc, char * const argv[])
> +{
> +       /*
> +        * Flush cache before jumping to application. Let's flush the
> +        * whole SDRAM area, since we don't know the size of the image
> +        * that was loaded.
> +        */
> +       flush_cache(gd->bd->bi_memstart, gd->bd->bi_memsize);

please replace gd->bd->bi_memsize with gd->ram_top. One reason is described in

https://patchwork.ozlabs.org/patch/677363/

This also covers MIPS platforms with 64 Bit or multiple or non-linear
memory mappings. Thanks.

Otherwise:

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>

> +
> +       return entry(argc, argv);
> +}
> --
> 2.25.0
>