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[PATCH v4 10/20] hw/arm/allwinner-h3: add Boot ROM support
From: |
Niek Linnenbank |
Subject: |
[PATCH v4 10/20] hw/arm/allwinner-h3: add Boot ROM support |
Date: |
Sun, 19 Jan 2020 01:50:52 +0100 |
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;
+ }
+
+ 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);
+ }
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);
--
2.17.1
- Re: [PATCH v4 03/20] hw/arm/allwinner-h3: add Clock Control Unit, (continued)
- [PATCH v4 02/20] hw/arm: add Xunlong Orange Pi PC machine, Niek Linnenbank, 2020/01/18
- [PATCH v4 05/20] hw/arm/allwinner-h3: add System Control module, Niek Linnenbank, 2020/01/18
- [PATCH v4 07/20] hw/arm/allwinner: add Security Identifier device, Niek Linnenbank, 2020/01/18
- [PATCH v4 01/20] hw/arm: add Allwinner H3 System-on-Chip, Niek Linnenbank, 2020/01/18
- [PATCH v4 10/20] hw/arm/allwinner-h3: add Boot ROM support,
Niek Linnenbank <=
- [PATCH v4 06/20] hw/arm/allwinner: add CPU Configuration module, Niek Linnenbank, 2020/01/18
- [PATCH v4 17/20] Acceptance tests: Extract _console_interaction(), Niek Linnenbank, 2020/01/18
- [PATCH v4 18/20] Acceptance tests: Add interrupt_interactive_console_until_pattern(), Niek Linnenbank, 2020/01/18
- [PATCH v4 13/20] tests/boot_linux_console: Add a quick test for the OrangePi PC board, Niek Linnenbank, 2020/01/18
- [PATCH v4 15/20] tests/boot_linux_console: Add a SD card test for the OrangePi PC board, Niek Linnenbank, 2020/01/18
- [PATCH v4 14/20] tests/boot_linux_console: Add initrd test for the Orange Pi PC board, Niek Linnenbank, 2020/01/18
- [PATCH v4 16/20] tests/boot_linux_console: Add a SLOW test booting Ubuntu on OrangePi PC, Niek Linnenbank, 2020/01/18