| # SPDX-License-Identifier: GPL-2.0+ |
| # Copyright (c) 2016 Google, Inc |
| # Written by Simon Glass <sjg@chromium.org> |
| # |
| # Entry-type module for the 16-bit x86 start-up code for U-Boot |
| # |
| |
| from entry import Entry |
| from blob import Entry_blob |
| |
| class Entry_x86_start16(Entry_blob): |
| """x86 16-bit start-up code for U-Boot |
| |
| Properties / Entry arguments: |
| - filename: Filename of u-boot-x86-16bit.bin (default |
| 'u-boot-x86-16bit.bin') |
| |
| x86 CPUs start up in 16-bit mode, even if they are 32-bit CPUs. This code |
| must be placed at a particular address. This entry holds that code. It is |
| typically placed at offset CONFIG_SYS_X86_START16. The code is responsible |
| for changing to 32-bit mode and jumping to U-Boot's entry point, which |
| requires 32-bit mode (for 32-bit U-Boot). |
| |
| For 64-bit U-Boot, the 'x86_start16_spl' entry type is used instead. |
| """ |
| def __init__(self, section, etype, node): |
| Entry_blob.__init__(self, section, etype, node) |
| |
| def GetDefaultFilename(self): |
| return 'u-boot-x86-16bit.bin' |
