---
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;
--
2.30.2
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