u-boot.git/arch/x86/lib, branch v2017.07

x86: fsp: Remove the call to set up internal uart in fsp_init()

2017-06-05T00:55:22Z

First of all, it's inappropriate to call setup_internal_uart() in a generic API fsp_init(), as CONFIG_INTERNAL_UART is an option that is only available on BayTrail platform. Secondly even for BayTrail, there is no need to call setup_internal_uart() at all, as Intel FSP will do this for us. Signed-off-by: Bin Meng Reviewed-by: Stefan Roese Reviewed-by: Simon Glass

x86: bootm: Add dm_remove_devices_flags() call to bootm_announce_and_cleanup()

2017-05-17T09:13:06Z

This patch adds a call to dm_remove_devices_flags() to bootm_announce_and_cleanup() so that drivers that have one of the removal flags set (e.g. DM_FLAG_ACTIVE_DMA_REMOVE) in their driver struct, may do some last-stage cleanup before the OS is started. Signed-off-by: Stefan Roese Cc: Bin Meng Reviewed-by: Simon Glass

x86: acpi: Fix Windows S3 resume failure

2017-05-17T09:11:46Z

U-Boot sets up the real mode interrupt handler stubs starting from address 0x1000. In most cases, the first 640K (0x00000 - 0x9ffff) system memory is reported as system RAM in E820 table to the OS. (see install_e820_map() implementation for each platform). So OS can use these memories whatever it wants. If U-Boot is in an S3 resume path, care must be taken not to corrupt these memorie otherwise OS data gets lost. Testing shows that, on Microsoft Windows 10 on Intel Baytrail its wake up vector happens to be installed at the same address 0x1000. While on Linux its wake up vector does not overlap this memory range, but after resume kernel checks low memory range per config option CONFIG_X86_RESERVE_LOW which is 64K by default to see whether a memory corruption occurs during the suspend/resume (it's harmless, but warnings are shown in the kernel dmesg logs). We cannot simply mark the these memory as reserved in E820 table because such configuration makes GRUB complain: unable to allocate real mode page. Hence we choose to back up these memories to the place where we reserved on our stack for our S3 resume work. Before jumping to OS wake up vector, we need restore the original content there. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese

x86: acpi: Turn on ACPI mode for S3

2017-05-17T09:11:46Z

Before jumping to OS waking up vector, we need turn on ACPI mode for S3, just like what we do for a normal boot. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese

x86: acpi: Refactor acpi_resume()

2017-05-17T09:11:46Z

To do something more in acpi_resume() like turning on ACPI mode, we need locate ACPI FADT table pointer first. But currently this is done in acpi_find_wakeup_vector(). This changes acpi_resume() signature to accept ACPI FADT pointer as the parameter. A new API acpi_find_fadt() is introduced, and acpi_find_wakeup_vector() is updated to use FADT pointer as the parameter as well. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese

x86: acpi: Make enter_acpi_mode() public

2017-05-17T09:11:46Z

enter_acpi_mode() is useful on other boot path like S3 resume, so make it public. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese

x86: apci: Change PM1_CNT register access to RMW

2017-05-17T09:11:46Z

In enter_acpi_mode() PM1_CNT register is changed to PM1_CNT_SCI_EN directly without preserving its previous value. Update to change the register access to read-modify-write (RMW). Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese

x86: Do not clear high table area for S3

2017-05-17T09:11:46Z

When SeaBIOS is being used, U-Boot reserves a memory area to be used for configuration tables like ACPI. But it should not be cleared otherwise ACPI table will be missing. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese

x86: fsp: Save stack address to CMOS for next S3 boot

2017-05-17T09:11:46Z

At the end of pre-relocation phase, save the new stack address to CMOS and use it as the stack on next S3 boot for fsp_init() continuation function. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese

x86: Add an early CMOS access library

2017-05-17T09:11:46Z

This adds a library that provides CMOS (inside RTC SRAM) access at a very early stage when driver model is not available yet. Signed-off-by: Bin Meng Reviewed-by: Simon Glass Tested-by: Stefan Roese