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Re: [PATCH v7 10/18] hw/arm/allwinner-h3: add Boot ROM support


From: Alex Bennée
Subject: Re: [PATCH v7 10/18] hw/arm/allwinner-h3: add Boot ROM support
Date: Wed, 11 Mar 2020 13:58:09 +0000
User-agent: mu4e 1.3.9; emacs 28.0.50

Niek Linnenbank <address@hidden> writes:

> A real Allwinner H3 SoC contains a Boot ROM which is the
> first code that runs right after the SoC is powered on.
> The Boot ROM is responsible for loading user code (e.g. a bootloader)
> from any of the supported external devices and writing the downloaded
> code to internal SRAM. After loading the SoC begins executing the code
> written to SRAM.
>
> This commits adds emulation of the Boot ROM firmware setup functionality
> by loading user code from SD card in the A1 SRAM. While the A1 SRAM is
> 64KiB, we limit the size to 32KiB because the real H3 Boot ROM also rejects
> sizes larger than 32KiB. For reference, this behaviour is documented
> by the Linux Sunxi project wiki at:
>
>   https://linux-sunxi.org/BROM#U-Boot_SPL_limitations
>
> Signed-off-by: Niek Linnenbank <address@hidden>
> ---
>  include/hw/arm/allwinner-h3.h | 21 +++++++++++++++++++++
>  hw/arm/allwinner-h3.c         | 18 ++++++++++++++++++
>  hw/arm/orangepi.c             |  5 +++++
>  3 files changed, 44 insertions(+)
>
> diff --git a/include/hw/arm/allwinner-h3.h b/include/hw/arm/allwinner-h3.h
> index f9b9a02373..d338003724 100644
> --- a/include/hw/arm/allwinner-h3.h
> +++ b/include/hw/arm/allwinner-h3.h
> @@ -46,6 +46,7 @@
>  #include "hw/sd/allwinner-sdhost.h"
>  #include "hw/net/allwinner-sun8i-emac.h"
>  #include "target/arm/cpu.h"
> +#include "sysemu/block-backend.h"
>  
>  /**
>   * Allwinner H3 device list
> @@ -129,4 +130,24 @@ typedef struct AwH3State {
>      MemoryRegion sram_c;
>  } AwH3State;
>  
> +/**
> + * Emulate Boot ROM firmware setup functionality.
> + *
> + * A real Allwinner H3 SoC contains a Boot ROM
> + * which is the first code that runs right after
> + * the SoC is powered on. The Boot ROM is responsible
> + * for loading user code (e.g. a bootloader) from any
> + * of the supported external devices and writing the
> + * downloaded code to internal SRAM. After loading the SoC
> + * begins executing the code written to SRAM.
> + *
> + * This function emulates the Boot ROM by copying 32 KiB
> + * of data from the given block device and writes it to
> + * the start of the first internal SRAM memory.
> + *
> + * @s: Allwinner H3 state object pointer
> + * @blk: Block backend device object pointer
> + */
> +void allwinner_h3_bootrom_setup(AwH3State *s, BlockBackend *blk);
> +
>  #endif /* HW_ARM_ALLWINNER_H3_H */
> diff --git a/hw/arm/allwinner-h3.c b/hw/arm/allwinner-h3.c
> index d1245d2b01..56b5c563a8 100644
> --- a/hw/arm/allwinner-h3.c
> +++ b/hw/arm/allwinner-h3.c
> @@ -29,6 +29,7 @@
>  #include "hw/char/serial.h"
>  #include "hw/misc/unimp.h"
>  #include "hw/usb/hcd-ehci.h"
> +#include "hw/loader.h"
>  #include "sysemu/sysemu.h"
>  #include "hw/arm/allwinner-h3.h"
>  
> @@ -170,6 +171,23 @@ enum {
>      AW_H3_GIC_NUM_SPI       = 128
>  };
>  
> +void allwinner_h3_bootrom_setup(AwH3State *s, BlockBackend *blk)
> +{
> +    const int64_t rom_size = 32 * KiB;
> +    uint8_t *buffer = g_new0(uint8_t, rom_size);

There is an opportunity to use g_autofree here so you can skip..

> +    g_free(buffer);
> +}
> +
<snip>

Otherwise:

Reviewed-by: Alex Bennée <address@hidden>

-- 
Alex Bennée



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