diff options
Diffstat (limited to 'arch/x86/lib/tpl.c')
| -rw-r--r-- | arch/x86/lib/tpl.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/lib/tpl.c b/arch/x86/lib/tpl.c index d70f590541c..6ca3f7b1f20 100644 --- a/arch/x86/lib/tpl.c +++ b/arch/x86/lib/tpl.c @@ -5,6 +5,7 @@ #include <common.h> #include <debug_uart.h> +#include <dm.h> #include <spl.h> #include <asm/cpu.h> #include <asm/mtrr.h> @@ -115,3 +116,27 @@ void spl_board_init(void) { preloader_console_init(); } + +#if !CONFIG_IS_ENABLED(PCI) +/* + * This is a fake PCI bus for TPL when it doesn't have proper PCI. It is enough + * to bind the devices on the PCI bus, some of which have early-regs properties + * providing fixed BARs. Individual drivers program these BARs themselves so + * that they can access the devices. The BARs are allocated statically in the + * device tree. + * + * Once SPL is running it enables PCI properly, but does not auto-assign BARs + * for devices, so the TPL BARs continue to be used. Once U-Boot starts it does + * the auto allocation (after relocation). + */ +static const struct udevice_id tpl_fake_pci_ids[] = { + { .compatible = "pci-x86" }, + { } +}; + +U_BOOT_DRIVER(pci_x86) = { + .name = "pci_x86", + .id = UCLASS_SIMPLE_BUS, + .of_match = tpl_fake_pci_ids, +}; +#endif |