On Sun, Jan 19, 2020 at 8:14 PM Philippe Mathieu-Daudé <
address@hidden> wrote:
On 1/19/20 1:50 AM, Niek Linnenbank wrote:
> 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 | 23 +++++++++++++++++++++++
> hw/arm/allwinner-h3.c | 28 ++++++++++++++++++++++++++++
> hw/arm/orangepi.c | 5 +++++
> 3 files changed, 56 insertions(+)
>
> diff --git a/include/hw/arm/allwinner-h3.h b/include/hw/arm/allwinner-h3.h
> index f9b9a02373..f5e16266cd 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 +130,26 @@ 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
> + * @errp: Error object pointer for raising errors
> + */
> +void allwinner_h3_bootrom_setup(AwH3State *s, BlockBackend *blk,
> + Error **errp);
> +
> #endif /* HW_ARM_ALLWINNER_H3_H */
> diff --git a/hw/arm/allwinner-h3.c b/hw/arm/allwinner-h3.c
> index 1085223812..3d0470825a 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 +171,33 @@ enum {
> AW_H3_GIC_NUM_SPI = 128
> };
>
> +void allwinner_h3_bootrom_setup(AwH3State *s, BlockBackend *blk, Error **errp)
> +{
> + uint8_t *buffer;
> + int64_t rom_size = 32 * KiB;
> +
> + int64_t blk_size = blk_getlength(blk);
> + if (blk_size <= 0) {
> + error_setg(errp, "%s: failed to get BlockBackend size", __func__);
> + return;
> + }
> +
> + if (rom_size > blk_size) {
> + rom_size = blk_size;
This doesn't seem correct, have you tried to use a 1MB file?
This can't be bigger than the SRAM size, 64KB.
This check was supposed to take into account the possibility that
the BlockBackend is smaller than the rom_size. However, if the rom cannot
be read from the BlockBackend it will return an error code anyway.
So the check can simply be removed. Thanks!
> + }
> +
> + buffer = g_new0(uint8_t, rom_size);
> + if (blk_pread(blk, 8 * KiB, buffer, rom_size) < 0) {
> + error_setg(errp, "%s: failed to read BlockBackend data", __func__);
> + return;
> + }
> +
> + rom_add_blob("allwinner-h3.bootrom", buffer, rom_size,
> + rom_size, s->memmap[AW_H3_SRAM_A1],
> + NULL, NULL, NULL, NULL, false);
> + g_free(buffer);
> +}
> +
> static void allwinner_h3_init(Object *obj)
> {
> AwH3State *s = AW_H3(obj);
> diff --git a/hw/arm/orangepi.c b/hw/arm/orangepi.c
> index 25bf85f8fc..9d4c79885e 100644
> --- a/hw/arm/orangepi.c
> +++ b/hw/arm/orangepi.c
> @@ -95,6 +95,11 @@ static void orangepi_init(MachineState *machine)
> memory_region_add_subregion(get_system_memory(), s->h3->memmap[AW_H3_SDRAM],
> &s->sdram);
>
> + /* Load target kernel or start using BootROM */
> + if (!machine->kernel_filename && blk_is_available(blk)) {
> + /* Use Boot ROM to copy data from SD card to SRAM */
> + allwinner_h3_bootrom_setup(s->h3, blk, &error_fatal);
allwinner_h3_bootrom_setup() doesn't need the errp argument, you can use
error_fatal directly there.
OK, I'll use error_fatal and remove the errp argument.
Regards,
Niek
> + }
> orangepi_binfo.loader_start = s->h3->memmap[AW_H3_SDRAM];
> orangepi_binfo.ram_size = machine->ram_size;
> arm_load_kernel(ARM_CPU(first_cpu), machine, &orangepi_binfo);
>