The BootROM constrains us to a 64K big first stage bootloader. Add a PBL
entry point for a xload barebox that sets up the minimum necessary to
load a FAT32 barebox.bin from the SD-Card.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
arch/arm/boards/sama5d27-som1/lowlevel.c | 32 +++++++++------
arch/arm/mach-at91/Kconfig | 1 +
arch/arm/mach-at91/include/mach/barebox-arm.h | 21 ++++++++++
.../include/mach/sama5d2-sip-ddramc.h | 39 +++++++++++++++++++
images/Makefile.at91 | 5 +++
5 files changed, 87 insertions(+), 11 deletions(-)
create mode 100644 arch/arm/mach-at91/include/mach/barebox-arm.h
create mode 100644 arch/arm/mach-at91/include/mach/sama5d2-sip-ddramc.h
diff --git a/arch/arm/boards/sama5d27-som1/lowlevel.c b/arch/arm/boards/sama5d27-som1/lowlevel.c
index 2e408ce832f7..d52c4ca7465e 100644
--- a/arch/arm/boards/sama5d27-som1/lowlevel.c
+++ b/arch/arm/boards/sama5d27-som1/lowlevel.c
@@ -5,13 +5,12 @@
#include <common.h>
#include <init.h>
-
-#include <asm/barebox-arm-head.h>
-#include <asm/barebox-arm.h>
+#include <mach/barebox-arm.h>
#include <mach/sama5d2_ll.h>
#include <mach/iomux.h>
+#include <mach/xload.h>
#include <debug_ll.h>
-#include <mach/at91_dbgu.h>
+#include <mach/sama5d2-sip-ddramc.h>
#define RGB_LED_GREEN (1 << 0)
#define RGB_LED_RED (1 << 1)
@@ -40,23 +39,34 @@ static void ek_turn_led(unsigned color)
}
}
-static void ek_dbgu_init(void)
+SAMA5_ENTRY_FUNCTION(start_sama5d27_som1_ek_xload_mmc, r4)
{
- sama5d2_resetup_uart_console(MASTER_CLOCK);
+ void __iomem *dbgu_base;
+ sama5d2_lowlevel_init();
+
+ dbgu_base = sama5d2_resetup_uart_console(MASTER_CLOCK);
+ if (IS_ENABLED(CONFIG_DEBUG_LL))
+ putc_ll('>');
- putc_ll('>');
+ relocate_to_current_adr();
+ setup_c();
+
+ pbl_set_putc(at91_dbgu_putc, dbgu_base);
+
+ ek_turn_led(RGB_LED_RED | RGB_LED_GREEN); /* Yellow */
+ sama5d2_udelay_init(MASTER_CLOCK);
+ sama5d2_d1g_ddrconf();
+ sama5d2_sdhci_start_image(r4);
}
extern char __dtb_z_at91_sama5d27_som1_ek_start[];
-ENTRY_FUNCTION(start_sama5d27_som1_ek, r0, r1, r2)
+SAMA5_ENTRY_FUNCTION(start_sama5d27_som1_ek, r4)
{
void *fdt;
- arm_cpu_lowlevel_init();
-
if (IS_ENABLED(CONFIG_DEBUG_LL))
- ek_dbgu_init();
+ putc_ll('>');
fdt = __dtb_z_at91_sama5d27_som1_ek_start + get_runtime_offset();
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 25ef854bf0b5..f388d00b8f47 100644
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -603,6 +603,7 @@ config MACH_SAMA5D27_SOM1
bool "Microchip SAMA5D27 SoM-1 Evaluation Kit"
select SOC_SAMA5D2
select OFDEVICE
+ select MCI_ATMEL_SDHCI_PBL
select COMMON_CLK_OF_PROVIDER
help
Select this if you are using Microchip's sama5d27 SoM evaluation kit
diff --git a/arch/arm/mach-at91/include/mach/barebox-arm.h b/arch/arm/mach-at91/include/mach/barebox-arm.h
new file mode 100644
index 000000000000..4a65c6f8fa55
--- /dev/null
+++ b/arch/arm/mach-at91/include/mach/barebox-arm.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef AT91_BAREBOX_ARM_H_
+#define AT91_BAREBOX_ARM_H_
+
+#include <asm/barebox-arm.h>
+
+#define SAMA5_ENTRY_FUNCTION(name, r4) \
+ void name (u32 r0, u32 r1, u32 r2, u32 r3); \
+ \
+ static void __##name(u32); \
+ \
+ void NAKED __section(.text_head_entry_##name) name \
+ (u32 r0, u32 r1, u32 r2, u32 r3) \
+ { \
+ register u32 r4 asm("r4"); \
+ __barebox_arm_head(); \
+ __##name(r4); \
+ } \
+ static void NAKED noinline __##name \
+ (u32 r4)
+#endif
diff --git a/arch/arm/mach-at91/include/mach/sama5d2-sip-ddramc.h b/arch/arm/mach-at91/include/mach/sama5d2-sip-ddramc.h
new file mode 100644
index 000000000000..35c92c43fce8
--- /dev/null
+++ b/arch/arm/mach-at91/include/mach/sama5d2-sip-ddramc.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: BSD-1-Clause
+ *
+ * Copyright (C) 2014, Atmel Corporation
+ *
+ * SAMA5D27 System-in-Package DDRAMC configuration
+ */
+
+#include <mach/at91_ddrsdrc.h>
+#include <mach/ddramc.h>
+#include <mach/sama5d2_ll.h>
+
+static inline void sama5d2_d1g_ddrconf(void) /* DDR2 1Gbit SDRAM */
+{
+ struct at91_ddramc_register conf = {
+ .mdr = AT91_DDRC2_DBW_16_BITS | AT91_DDRC2_MD_DDR2_SDRAM,
+
+ .cr = AT91_DDRC2_NC_DDR10_SDR9 | AT91_DDRC2_NR_13 |
+ AT91_DDRC2_CAS_3 | AT91_DDRC2_DISABLE_RESET_DLL |
+ AT91_DDRC2_WEAK_STRENGTH_RZQ7 | AT91_DDRC2_ENABLE_DLL |
+ AT91_DDRC2_NB_BANKS_8 | AT91_DDRC2_NDQS_ENABLED |
+ AT91_DDRC2_DECOD_INTERLEAVED | AT91_DDRC2_UNAL_SUPPORTED,
+
+ .rtr = 0x511,
+
+ .t0pr = AT91_DDRC2_TRAS_(7) | AT91_DDRC2_TRCD_(3) |
+ AT91_DDRC2_TWR_(3) | AT91_DDRC2_TRC_(9) |
+ AT91_DDRC2_TRP_(3) | AT91_DDRC2_TRRD_(2) |
+ AT91_DDRC2_TWTR_(2) | AT91_DDRC2_TMRD_(2),
+
+ .t1pr = AT91_DDRC2_TRFC_(22) | AT91_DDRC2_TXSNR_(23) |
+ AT91_DDRC2_TXSRD_(200) | AT91_DDRC2_TXP_(2),
+
+ .t2pr = AT91_DDRC2_TXARD_(2) | AT91_DDRC2_TXARDS_(8) |
+ AT91_DDRC2_TRPA_(4) | AT91_DDRC2_TRTP_(2) |
+ AT91_DDRC2_TFAW_(8),
+ };
+
+ sama5d2_ddr2_init(&conf);
+}
diff --git a/images/Makefile.at91 b/images/Makefile.at91
index 448d71fb981d..bc63357c5d19 100644
--- a/images/Makefile.at91
+++ b/images/Makefile.at91
@@ -18,6 +18,11 @@ pblb-$(CONFIG_MACH_SAMA5D27_SOM1) += start_sama5d27_som1_ek
FILE_barebox-sama5d27-som1-ek.img = start_sama5d27_som1_ek.pblb
image-$(CONFIG_MACH_SAMA5D27_SOM1) += barebox-sama5d27-som1-ek.img
+pblb-$(CONFIG_MACH_SAMA5D27_SOM1) += start_sama5d27_som1_ek_xload_mmc
+MAX_PBL_IMAGE_SIZE_start_sama5d27_som1_ek_xload_mmc = 0xffff
+FILE_barebox-sama5d27-som1-ek-xload-mmc.img = start_sama5d27_som1_ek_xload_mmc.pblb
+image-$(CONFIG_MACH_SAMA5D27_SOM1) += barebox-sama5d27-som1-ek-xload-mmc.img
+
pblb-$(CONFIG_MACH_SAMA5D27_GIANTBOARD) += start_sama5d27_giantboard
FILE_barebox-groboards-sama5d27-giantboard.img = start_sama5d27_giantboard.pblb
image-$(CONFIG_MACH_SAMA5D27_GIANTBOARD) += barebox-groboards-sama5d27-giantboard.img
--
2.27.0
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