On 13.08.21 17:22, Uwe Kleine-König wrote:
> ---
I copied these changes to the nxp-imx8mn-evk, which has the same
ROM API and I can bootstrap with uuu, therefore:
Tested-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> arch/arm/boards/nxp-imx8mp-evk/lowlevel.c | 27 +++++++++++++++++++++++
> arch/arm/mach-imx/boot.c | 4 +++-
> include/asm-generic/sections.h | 1 +
> 3 files changed, 31 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c b/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c
> index 3298ded5866d..1fb7899198d6 100644
> --- a/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c
> +++ b/arch/arm/boards/nxp-imx8mp-evk/lowlevel.c
> @@ -99,6 +99,30 @@ static int power_init_board(void)
> return 0;
> }
>
> +/* read piggydata via a bootrom callback and place it behind our copy in SDRAM */
> +static int imx8m_bootrom_load_image(void)
> +{
> + int (*download_image)(u8 *dest, u32 offset, u32 size, u32 xor) = *(void **)0x988;
> + size_t count = __piggydata_end - __piggydata_start;
> + char *p = (char *)MX8M_ATF_BL33_BASE_ADDR + (__piggydata_start - __image_start);
> +
> + while (count) {
> + size_t chunksize = min(count, (size_t)1024);
> + int ret;
> +
> + ret = download_image(p, 0, chunksize, (uintptr_t)p ^ chunksize);
> + if (ret != 0xf0) {
> + pr_err("Failed to load piggy data (ret = %x)\n", ret);
> + return -EIO;
> + }
> +
> + p += chunksize;
> + count -= chunksize;
> + }
> +
> + return 0;
> +}
> +
> extern struct dram_timing_info imx8mp_evk_dram_timing;
>
> static void start_atf(void)
> @@ -125,6 +149,9 @@ static void start_atf(void)
> case BOOTSOURCE_MMC:
> imx8mp_esdhc_load_image(instance, false);
> break;
> + case BOOTSOURCE_SERIAL:
> + imx8m_bootrom_load_image();
> + break;
> default:
> printf("Unhandled bootsource BOOTSOURCE_%d\n", src);
> hang();
> diff --git a/arch/arm/mach-imx/boot.c b/arch/arm/mach-imx/boot.c
> index 2b66bbf71eb1..7c1d49291045 100644
> --- a/arch/arm/mach-imx/boot.c
> +++ b/arch/arm/mach-imx/boot.c
> @@ -495,10 +495,12 @@ static void __imx7_get_boot_source(enum bootsource *src, int *instance,
> case 5:
> *src = BOOTSOURCE_NOR;
> break;
> - case 15:
> + case 14: /* observed on i.MX8MP for USB "serial" booting */
> + case 15: /* observed on i.MX8MM for USB "serial" booting */
> *src = BOOTSOURCE_SERIAL;
> break;
> default:
> + *src = BOOTSOURCE_UNKNOWN;
> break;
> }
> }
> diff --git a/include/asm-generic/sections.h b/include/asm-generic/sections.h
> index 870bff21f668..597c4951ea5e 100644
> --- a/include/asm-generic/sections.h
> +++ b/include/asm-generic/sections.h
> @@ -9,6 +9,7 @@ extern char _end[];
> extern char __image_start[];
> extern char __image_end[];
> extern char __piggydata_start[];
> +extern char __piggydata_end[];
> extern void *_barebox_image_size;
> extern void *_barebox_bare_init_size;
> extern void *_barebox_pbl_size;
>
--
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