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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
- [PATCH v7 00/18] Add Allwinner H3 SoC and Orange Pi PC Machine, Niek Linnenbank, 2020/03/10
- [PATCH v7 02/18] hw/arm: add Xunlong Orange Pi PC machine, Niek Linnenbank, 2020/03/10
- [PATCH v7 04/18] hw/arm/allwinner-h3: add USB host controller, Niek Linnenbank, 2020/03/10
- [PATCH v7 05/18] hw/arm/allwinner-h3: add System Control module, Niek Linnenbank, 2020/03/10
- [PATCH v7 03/18] hw/arm/allwinner-h3: add Clock Control Unit, Niek Linnenbank, 2020/03/10
- [PATCH v7 01/18] hw/arm: add Allwinner H3 System-on-Chip, Niek Linnenbank, 2020/03/10
- [PATCH v7 10/18] hw/arm/allwinner-h3: add Boot ROM support, Niek Linnenbank, 2020/03/10
- Re: [PATCH v7 10/18] hw/arm/allwinner-h3: add Boot ROM support,
Alex Bennée <=
- [PATCH v7 07/18] hw/arm/allwinner: add Security Identifier device, Niek Linnenbank, 2020/03/10
[PATCH v7 06/18] hw/arm/allwinner: add CPU Configuration module, Niek Linnenbank, 2020/03/10
[PATCH v7 13/18] tests/boot_linux_console: Add a quick test for the OrangePi PC board, Niek Linnenbank, 2020/03/10