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Add support for building a chained u-boot for nyan-big

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Peter Robinson 2017-05-29 14:51:35 +01:00
parent 6c8ea4982c
commit 5a9f4ddc50
2 changed files with 762 additions and 2 deletions
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arm-tegra-nyan-chromebook.patch Normal file
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@ -0,0 +1,758 @@
From 51a3b64ace7004cacf0d53326806fefded3e1b18 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:21 -0600
Subject: [PATCH 01/12] arm: arm720t: Support CONFIG_SKIP_LOWLEVEL_INIT_ONLY
This option allows skipping the call to lowlevel() while still performing
CP15 init. Support this on ARM720T so it can be used with Tegra.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
arch/arm/cpu/arm720t/start.S | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/arm720t/start.S b/arch/arm/cpu/arm720t/start.S
index 0bb3441fb8..365d8f08cb 100644
--- a/arch/arm/cpu/arm720t/start.S
+++ b/arch/arm/cpu/arm720t/start.S
@@ -38,7 +38,8 @@ reset:
* we do sys-critical inits only at reboot,
* not when booting from ram!
*/
-#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \
+ !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY)
bl cpu_init_crit
#endif
@@ -62,7 +63,8 @@ c_runtime_cpu_setup:
*************************************************************************
*/
-#ifndef CONFIG_SKIP_LOWLEVEL_INIT
+#if !defined(CONFIG_SKIP_LOWLEVEL_INIT) && \
+ !defined(CONFIG_SKIP_LOWLEVEL_INIT_ONLY)
cpu_init_crit:
mov ip, lr
--
2.13.0
From 820962e319b41a0b3ab8f2c0717ead575be4f04a Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:22 -0600
Subject: [PATCH 02/12] tegra: Init clocks even when SPL did not run
At present early clock init happens in SPL. If SPL did not run (because
for example U-Boot is chain-loaded from another boot loader) then the
clocks are not set as U-Boot expects.
Add a function to detect this and call the early clock init in U-Boot
proper.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
arch/arm/include/asm/arch-tegra/clock.h | 3 +++
arch/arm/mach-tegra/board2.c | 3 +++
arch/arm/mach-tegra/clock.c | 5 +++++
arch/arm/mach-tegra/tegra124/clock.c | 18 ++++++++++++++++++
4 files changed, 29 insertions(+)
diff --git a/arch/arm/include/asm/arch-tegra/clock.h b/arch/arm/include/asm/arch-tegra/clock.h
index 388afcb723..f62b2a4378 100644
--- a/arch/arm/include/asm/arch-tegra/clock.h
+++ b/arch/arm/include/asm/arch-tegra/clock.h
@@ -288,6 +288,9 @@ void clock_init(void);
/* Initialize the PLLs */
void clock_early_init(void);
+/* @return true if hardware indicates that clock_early_init() was called */
+bool clock_early_init_done(void);
+
/* Returns a pointer to the clock source register for a peripheral */
u32 *get_periph_source_reg(enum periph_id periph_id);
diff --git a/arch/arm/mach-tegra/board2.c b/arch/arm/mach-tegra/board2.c
index 84f1ee5035..1e627ba603 100644
--- a/arch/arm/mach-tegra/board2.c
+++ b/arch/arm/mach-tegra/board2.c
@@ -191,6 +191,9 @@ void gpio_early_init(void) __attribute__((weak, alias("__gpio_early_init")));
int board_early_init_f(void)
{
+ if (!clock_early_init_done())
+ clock_early_init();
+
#if defined(CONFIG_TEGRA_DISCONNECT_UDC_ON_BOOT)
#define USBCMD_FS2 (1 << 15)
{
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index 3bb72331a4..76436d8d91 100644
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -825,3 +825,8 @@ int clock_external_output(int clk_id)
return 0;
}
+
+__weak bool clock_early_init_done(void)
+{
+ return true;
+}
diff --git a/arch/arm/mach-tegra/tegra124/clock.c b/arch/arm/mach-tegra/tegra124/clock.c
index 5e4406102f..5ae718b342 100644
--- a/arch/arm/mach-tegra/tegra124/clock.c
+++ b/arch/arm/mach-tegra/tegra124/clock.c
@@ -891,6 +891,24 @@ void clock_early_init(void)
udelay(2);
}
+/*
+ * clock_early_init_done - Check if clock_early_init() has been called
+ *
+ * Check a register that we set up to see if clock_early_init() has already
+ * been called.
+ *
+ * @return true if clock_early_init() was called, false if not
+ */
+bool clock_early_init_done(void)
+{
+ struct clk_rst_ctlr *clkrst = (struct clk_rst_ctlr *)NV_PA_CLK_RST_BASE;
+ u32 val;
+
+ val = readl(&clkrst->crc_sclk_brst_pol);
+
+ return val == 0x20002222;
+}
+
void arch_timer_init(void)
{
struct sysctr_ctlr *sysctr = (struct sysctr_ctlr *)NV_PA_TSC_BASE;
--
2.13.0
From a744ffcceb2417fc86743e301c44fb67b6ab1fde Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:23 -0600
Subject: [PATCH 03/12] tegra: dts: Add cros-ec SPI settings
At present the interrupt does not work and the SPI bus runs much less
quickly than it should. Add settings to fix this.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
arch/arm/dts/tegra124-nyan-big-u-boot.dtsi | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm/dts/tegra124-nyan-big-u-boot.dtsi b/arch/arm/dts/tegra124-nyan-big-u-boot.dtsi
index fff1d78169..65c3851aff 100644
--- a/arch/arm/dts/tegra124-nyan-big-u-boot.dtsi
+++ b/arch/arm/dts/tegra124-nyan-big-u-boot.dtsi
@@ -12,4 +12,13 @@
u-boot,dm-pre-reloc;
};
};
+
+ spi@7000d400 {
+ spi-deactivate-delay = <200>;
+ spi-max-frequency = <3000000>;
+
+ cros_ec: cros-ec@0 {
+ ec-interrupt = <&gpio TEGRA_GPIO(C, 7) GPIO_ACTIVE_LOW>;
+ };
+ };
};
--
2.13.0
From 829c38b95a27652e99e6cc8516199e492d1ac8a5 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:24 -0600
Subject: [PATCH 04/12] arm: Rename HCTR to HTCR
This appears to be a typo. Fix it.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
arch/arm/lib/cache-cp15.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c
index e9bbcf5122..0f7020a315 100644
--- a/arch/arm/lib/cache-cp15.c
+++ b/arch/arm/lib/cache-cp15.c
@@ -147,7 +147,7 @@ static inline void mmu_setup(void)
#endif
if (is_hyp()) {
- /* Set HCTR to enable LPAE */
+ /* Set HTCR to enable LPAE */
asm volatile("mcr p15, 4, %0, c2, c0, 2"
: : "r" (reg) : "memory");
/* Set HTTBR0 */
--
2.13.0
From 33755d05d5f4e4f123e617663a7de2ca71c5039e Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:25 -0600
Subject: [PATCH 05/12] arm: Don't try to support CONFIG_ARMV7_LPAE on ARMv4T
At present if CONFIG_ARMV7_LPAE is defined then mmu_setup() will use
instructions which are invalid on ARMv4T. This happens on Tegra since it
has an ARMv4T boot CPU. Add a check for the architecture version to allow
the code to be built. It will not actually be executed by the boot CPU,
but needs to compile.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
arch/arm/lib/cache-cp15.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c
index 0f7020a315..f293573601 100644
--- a/arch/arm/lib/cache-cp15.c
+++ b/arch/arm/lib/cache-cp15.c
@@ -129,7 +129,7 @@ static inline void mmu_setup(void)
dram_bank_mmu_setup(i);
}
-#ifdef CONFIG_ARMV7_LPAE
+#if defined(CONFIG_ARMV7_LPAE) && __LINUX_ARM_ARCH__ != 4
/* Set up 4 PTE entries pointing to our 4 1GB page tables */
for (i = 0; i < 4; i++) {
u64 *page_table = (u64 *)(gd->arch.tlb_addr + (4096 * 4));
--
2.13.0
From 6a56c16bcf12fa1306eef36b4c95e177bf9ffeeb Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:26 -0600
Subject: [PATCH 06/12] arm: Disable LPAE if not enabled
If CONFIG_ARMV7_LPAE is not defined we should make sure that the feature
is disabled. This can happen if U-Boot is chain-loaded from another boot
loader which does enable LPAE.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
---
arch/arm/lib/cache-cp15.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/arm/lib/cache-cp15.c b/arch/arm/lib/cache-cp15.c
index f293573601..cf852c061b 100644
--- a/arch/arm/lib/cache-cp15.c
+++ b/arch/arm/lib/cache-cp15.c
@@ -172,6 +172,15 @@ static inline void mmu_setup(void)
: : "r" (MEMORY_ATTRIBUTES) : "memory");
}
#elif defined(CONFIG_CPU_V7)
+ if (is_hyp()) {
+ /* Set HTCR to disable LPAE */
+ asm volatile("mcr p15, 4, %0, c2, c0, 2"
+ : : "r" (0) : "memory");
+ } else {
+ /* Set TTBCR to disable LPAE */
+ asm volatile("mcr p15, 0, %0, c2, c0, 2"
+ : : "r" (0) : "memory");
+ }
/* Set TTBR0 */
reg = gd->arch.tlb_addr & TTBR0_BASE_ADDR_MASK;
#if defined(CONFIG_SYS_ARM_CACHE_WRITETHROUGH)
--
2.13.0
From c19168287ab9dcaf7f9744c71b6d4385480bbd27 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:27 -0600
Subject: [PATCH 07/12] tegra: spi: Wait a little after setting the clocks
For devices that need a delay between SPI transactions we seem to need an
additional delay before the first one if the CPU is running at full speed.
Add this, under control of the existing setting. At present it will only
be enabled with the Chrome OS EC.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
drivers/spi/tegra114_spi.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/spi/tegra114_spi.c b/drivers/spi/tegra114_spi.c
index 897409ca02..055cec599c 100644
--- a/drivers/spi/tegra114_spi.c
+++ b/drivers/spi/tegra114_spi.c
@@ -152,6 +152,7 @@ static int tegra114_spi_probe(struct udevice *bus)
bus->name, priv->freq, rate);
}
}
+ udelay(plat->deactivate_delay_us);
/* Clear stale status here */
setbits_le32(&regs->fifo_status,
--
2.13.0
From 6012b06cfd360b0d7815222af3a9feb274abb6ce Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:29 -0600
Subject: [PATCH 08/12] tegra: video: Don't power up the SOR twice
If U-Boot is the secondary boot loader, or has been run from itself, the
SOR may already be powered up. Powering it up again causes a hang, so
detect this situation and skip it.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
drivers/video/tegra124/sor.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/video/tegra124/sor.c b/drivers/video/tegra124/sor.c
index 5e4140ff53..4324071cdc 100644
--- a/drivers/video/tegra124/sor.c
+++ b/drivers/video/tegra124/sor.c
@@ -466,11 +466,20 @@ void tegra_dc_sor_set_lane_count(struct udevice *dev, u8 lane_count)
static int tegra_dc_sor_power_up(struct udevice *dev, int is_lvds)
{
struct tegra_dc_sor_data *sor = dev_get_priv(dev);
+ u32 reg;
int ret;
if (sor->power_is_up)
return 0;
+ /*
+ * If for some reason it is already powered up, don't do it again.
+ * This can happen if U-Boot is the secondary boot loader.
+ */
+ reg = tegra_sor_readl(sor, DP_PADCTL(sor->portnum));
+ if (reg & DP_PADCTL_PD_TXD_0_NO)
+ return 0;
+
/* Set link bw */
tegra_dc_sor_set_link_bandwidth(dev, is_lvds ?
CLK_CNTRL_DP_LINK_SPEED_LVDS :
--
2.13.0
From 46d0d0f5d2a6b9a22fec1c5951cbf7c861e94435 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:30 -0600
Subject: [PATCH 09/12] tegra: Enable CP15 init
At present CP15 init is disabled on tegra. Use the correct option so that
this init is performed on boot. This enables the instruction cache, for
example, which is critical to the machine running at full speed.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
include/configs/tegra-common-post.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/configs/tegra-common-post.h b/include/configs/tegra-common-post.h
index ab4136ab13..35d5d8bdc0 100644
--- a/include/configs/tegra-common-post.h
+++ b/include/configs/tegra-common-post.h
@@ -105,7 +105,7 @@
/* overrides for SPL build here */
#ifdef CONFIG_SPL_BUILD
-#define CONFIG_SKIP_LOWLEVEL_INIT
+#define CONFIG_SKIP_LOWLEVEL_INIT_ONLY
/* remove I2C support */
#ifdef CONFIG_SYS_I2C_TEGRA
--
2.13.0
From 1b716e6972e3d7b90f86df28ac0daaecc5989871 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:31 -0600
Subject: [PATCH 10/12] tegra: clock: Avoid a divide-by-zero error
The clock fix-up for tegra is still present in the code. It causes a
divide-by-zero bug after relocation when chain-loading U-Boot from
coreboot. Fix this by adding a check.
Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 7468676 (ARM: tegra: fix clock_get_periph_rate() for UART clocks)
---
arch/arm/mach-tegra/clock.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/arch/arm/mach-tegra/clock.c b/arch/arm/mach-tegra/clock.c
index 76436d8d91..bac42119cd 100644
--- a/arch/arm/mach-tegra/clock.c
+++ b/arch/arm/mach-tegra/clock.c
@@ -339,8 +339,11 @@ unsigned long clock_get_periph_rate(enum periph_id periph_id,
* return value doesn't help. In summary this clock driver is
* quite broken but I'm afraid I have no idea how to fix it
* without completely replacing it.
+ *
+ * Be careful to avoid a divide by zero error.
*/
- div -= 2;
+ if (div >= 1)
+ div -= 2;
break;
#endif
default:
--
2.13.0
From 2f66e693a62b1ef51d0c8dca7f76f522258958a7 Mon Sep 17 00:00:00 2001
From: Simon Glass <sjg@chromium.org>
Date: Mon, 22 May 2017 05:17:32 -0600
Subject: [PATCH 11/12] README: Add instructions for chain-loading U-Boot
Most Chromebooks support chain-loading U-Boot but instructions are
somewhat scattered. Add a README to hold this information within the
U-Boot tree. Also add the standard developer keys to simplify the
instructions, since they are small.
For now this only supports nyan-big.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
doc/README.chromium | 222 +++++++++++++++++++++++++++
doc/chromium/devkeys/kernel.keyblock | Bin 0 -> 1208 bytes
doc/chromium/devkeys/kernel_data_key.vbprivk | Bin 0 -> 1199 bytes
3 files changed, 222 insertions(+)
create mode 100644 doc/README.chromium
create mode 100644 doc/chromium/devkeys/kernel.keyblock
create mode 100644 doc/chromium/devkeys/kernel_data_key.vbprivk
diff --git a/doc/README.chromium b/doc/README.chromium
new file mode 100644
index 0000000000..1dd111c65d
--- /dev/null
+++ b/doc/README.chromium
@@ -0,0 +1,222 @@
+Running U-Boot from coreboot on Chromebooks
+===========================================
+
+U-Boot can be used as a secondary boot loader in a few situations such as from
+UEFI and coreboot (see README.x86). Recent Chromebooks use coreboot even on
+ARM platforms to start up the machine.
+
+This document aims to provide a guide to booting U-Boot on a Chromebook. It
+is only a starting point, and there are many guides on the interwebs. But
+placing this information in the U-Boot tree should make it easier to find for
+those who use U-Boot habitually.
+
+Most of these platforms are supported by U-Boot natively, but it is risky to
+replace the ROM unless you have a servo board and cable to restore it with.
+
+
+For all of these the standard U-Boot build instructions apply. For example on
+ARM:
+
+ sudo apt install gcc-arm-linux-gnueabi
+ mkdir b
+ make O=b/nyan_big CROSS_COMPILE=arm-linux-gnueabi- nyan-big_defconfig all
+
+You can obtain the vbutil_kernel utility here:
+
+ https://drive.google.com/open?id=0B7WYZbZ9zd-3dHlVVXo4VXE2T0U
+
+
+Snow (Samsung ARM Chromebook)
+-----------------------------
+
+See here:
+
+https://www.chromium.org/chromium-os/firmware-porting-guide/using-nv-u-boot-on-the-samsung-arm-chromebook
+
+
+Nyan-big
+--------
+
+Compiled based on information here:
+https://lists.denx.de/pipermail/u-boot/2015-March/209530.html
+https://git.collabora.com/cgit/user/tomeu/u-boot.git/commit/?h=nyan-big
+https://lists.denx.de/pipermail/u-boot/2017-May/289491.html
+https://github.com/chromeos-nvidia-androidtv/gnu-linux-on-acer-chromebook-13#copy-data-to-the-sd-card
+
+1. Patch U-Boot
+
+Open include/configs/tegra124-common.h
+
+Change:
+
+#define CONFIG_SYS_TEXT_BASE 0x80110000
+
+to:
+
+#define CONFIG_SYS_TEXT_BASE 0x81000100
+
+
+2. Build U-Boot
+
+ mkdir b
+ make -j8 O=b/nyan-big CROSS_COMPILE=arm-linux-gnueabi- nyan-big_defconfig all
+
+
+3. Create a file called u-boot.its as follows:
+
+/dts-v1/;
+
+/ {
+ description = "U-Boot mainline";
+ #address-cells = <1>;
+
+ images {
+ kernel@1 {
+ description = "U-Boot mainline";
+ type = "kernel_noload";
+ arch = "arm";
+ os = "linux";
+ data = /incbin/("./b/nyan-big/u-boot.bin");
+ compression = "none";
+ load = <0>;
+ entry = <0>;
+ hash@2 {
+ algo = "sha1";
+ };
+ };
+
+ fdt@1{
+ description = "tegra124-nyan-big.dtb";
+ data = /incbin/("./b/nyan-big/u-boot.dtb");
+ type = "flat_dt";
+ arch = "arm";
+ compression = "none";
+ hash@1{
+ algo = "sha1";
+ };
+ };
+ };
+
+ configurations {
+ default = "config@1";
+ config@1 {
+ description = "Boot U-Boot";
+ kernel = "kernel@1";
+ fdt = "fdt@1";
+ };
+ };
+};
+
+
+Note that the device tree node is required, even though it is not actually
+used by U-Boot. This is because the Chromebook expects to pass it to the
+kernel, and crashes if it is not present.
+
+
+4. Build and sign an image
+
+ ./b/nyan-big/tools/mkimage -f u-boot.its u-boot-chromium.fit
+ vbutil_kernel --arch arm --keyblock doc/chromium/devkeys/kernel.keyblock \
+ --signprivate doc/chromium/devkeys/kernel_data_key.vbprivk \
+ --version 1 --config dummy.txt --vmlinuz u-boot-chromium.fit \
+ --bootloader dummy.txt --pack u-boot.kpart
+
+
+5. Prepare an SD card
+
+ DISK=/dev/sdc # Replace with your actual SD card device
+ sudo cgpt create $DISK
+ sudo cgpt add -b 34 -s 32768 -P 1 -S 1 -t kernel $DISK
+ sudo cgpt add -b 32802 -s 2000000 -t rootfs $DISK
+ sudo gdisk $DISK #
+
+
+6. Write U-Boot to the SD card
+
+ sudo dd if=u-boot.kpart of=/dev/sdc1; sync
+
+
+7. Start it up
+
+Reboot the device in dev mode. Make sure that you have USB booting enabled. To
+do this, login as root (via Ctrl-Alt-forward_arrow) and type
+'enable_dev_usb_boot'. You only need to do this once.
+
+Reboot the device with the SD card inserted. Press Clrl-U at the developer
+mode screen. It should show something like the following on the display:
+
+ U-Boot 2017.07-00637-g242eb42-dirty (May 22 2017 - 06:14:21 -0600)
+
+ Model: Acer Chromebook 13 CB5-311
+ Board: Google/NVIDIA Nyan-big, ID: 1
+
+ Net: No ethernet found.
+ Hit any key to stop autoboot: 0
+ Tegra124 (Nyan-big) #
+
+
+8. Known problems
+
+On the serial console the word MMC is chopped at the start of the line:
+
+C: sdhci@700b0000: 2, sdhci@700b0400: 1, sdhci@700b0600: 0
+
+This is likely due to some problem with change-over of the serial driver
+during relocation (or perhaps updating the clock setup in board_init()).
+
+
+9. Notes
+
+To check that you copied the u-boot.its file correctly, use these commands.
+You should see that the data at 0x100 in u-boot-chromium.fit is the first few
+bytes of U-Boot:
+
+ hd u-boot-chromium.fit |head -20
+ ...
+ 00000100 b8 00 00 ea 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 |................|
+
+ hd b/nyan-big/u-boot.bin |head
+ 00000000 b8 00 00 ea 14 f0 9f e5 14 f0 9f e5 14 f0 9f e5 |................|
+
+
+The 'data' property of the FIT is set up to start at offset 0x100 bytes into
+the file. The change to CONFIG_SYS_TEXT_BASE is also an offset of 0x100 bytes
+from the load address. If this changes, you either need to modify U-Boot to be
+fully relocatable, or expect it to hang.
+
+
+Other notes
+===========
+
+flashrom
+--------
+
+ Used to make a backup of your firmware, or to replace it.
+
+ See: https://www.chromium.org/chromium-os/packages/cros-flashrom
+
+
+coreboot
+--------
+
+Coreboot itself is not designed to actually boot an OS. Instead, a program
+called Depthcharge is used. This originally came out of U-Boot and was then
+heavily hacked and modified such that is is almost unrecognisable. It does
+include a very small part of the U-Boot command-line interface but is not
+usable as a general-purpose boot loader.
+
+In addition, it has a very unusual design in that it does not do device init
+itself, but instead relies on coreboot. This is similar to (in U-Boot) having
+a SPI driver with an empty probe() method, relying on whatever was set up
+beforehand. It can be quite hard to figure out between these two code bases
+what settings are actually used. When chain-loading into U-Boot we must be
+careful to reinit anything that U-Boot expects. If not, some peripherals (or
+the whole machine) may not work. This makes the process of chainloading more
+complicated than it could be on some platforms.
+
+Finally, it supports only a subset of the U-Boot's FIT format. In particular
+it uses a fixed address to load the FIT and does not support load/exec
+addresses. This means that U-Boot must be able to boot from whatever
+address Depthcharge happens to use (it is the CONFIG_KERNEL_START setting
+in Depthcharge). In practice this means that the data in the kernel@1 FIT node
+(see above) must start at the same address as U-Boot's CONFIG_SYS_TEXT_BASE.
diff --git a/doc/chromium/devkeys/kernel.keyblock b/doc/chromium/devkeys/kernel.keyblock
new file mode 100644
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diff --git a/doc/chromium/devkeys/kernel_data_key.vbprivk b/doc/chromium/devkeys/kernel_data_key.vbprivk
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HcmV?d00001
--
2.13.0
From d0044b52ff67fd96d9576554994fac778d3f2f1f Mon Sep 17 00:00:00 2001
From: Peter Robinson <pbrobinson@gmail.com>
Date: Mon, 29 May 2017 14:22:28 +0100
Subject: [PATCH 12/12] tegra: nyan-big: Enable the dhrystone benchmark
Enable this so we can roughly measure CPU performance. Also enable the
cache command to allow for timing.
Signed-off-by: Simon Glass <sjg@chromium.org>
---
configs/nyan-big_defconfig | 2 ++
1 file changed, 2 insertions(+)
diff --git a/configs/nyan-big_defconfig b/configs/nyan-big_defconfig
index 42fe120786..85a8bb80c3 100644
--- a/configs/nyan-big_defconfig
+++ b/configs/nyan-big_defconfig
@@ -23,6 +23,7 @@ CONFIG_CMD_GPIO=y
# CONFIG_CMD_SETEXPR is not set
# CONFIG_CMD_NFS is not set
CONFIG_CMD_BMP=y
+CONFIG_CMD_CACHE=y
CONFIG_CMD_PMIC=y
CONFIG_CMD_REGULATOR=y
CONFIG_CMD_TPM=y
@@ -63,5 +64,6 @@ CONFIG_DM_VIDEO=y
CONFIG_DISPLAY=y
CONFIG_VIDEO_TEGRA124=y
CONFIG_VIDEO_BRIDGE=y
+CONFIG_CMD_DHRYSTONE=y
CONFIG_TPM=y
CONFIG_ERRNO_STR=y
--
2.13.0

6
uboot-tools.spec
View File

@ -20,8 +20,9 @@ Patch5: sti-STiH410-B2260-support.patch
Patch6: AW64-add-spl-atf-support.patch
Patch7: use-Fedora-specific-EFI-path-name.patch
Patch8: clearfog-distroboot.patch
Patch9: arm-tegra-nyan-chromebook.patch
# Patch9: 0001-arm-mvebu-enable-generic-distro-boot-config.patch
# Patch19: 0001-arm-mvebu-enable-generic-distro-boot-config.patch
BuildRequires: bc
BuildRequires: dtc
@ -261,8 +262,9 @@ cp -p board/warp7/README builds/docs/README.warp7
%endif
%changelog
* Wed May 17 2017 Peter Robinson <pbrobinson@fedoraproject.org> 2017.05-02
* Mon May 29 2017 Peter Robinson <pbrobinson@fedoraproject.org> 2017.05-02
- Add distro-boot support for ClearFog
- Add support for building a chained u-boot for nyan-big
* Tue May 9 2017 Peter Robinson <pbrobinson@fedoraproject.org> 2017.05-01
- 2017.05