Extend CBFS to support arbitrary ROM source media.
Summary:
Isolate CBFS underlying I/O to board/arch-specific implementations as
"media stream", to allow loading and booting romstage on non-x86.
CBFS functions now all take a new "media source" parameter; use
CBFS_DEFAULT_MEDIA if you simply want to load from main firmware.
API Changes:
cbfs_find => cbfs_get_file.
cbfs_find_file => cbfs_get_file_content.
cbfs_get_file => cbfs_get_file_content with correct type.
CBFS used to work only on memory-mapped ROM (all x86). For platforms like ARM,
the ROM may come from USB, UART, or SPI -- any serial devices and not available
for memory mapping.
To support these devices (and allowing CBFS to read from multiple source
at the same time), CBFS operations are now virtual-ized into "cbfs_media". To
simplify porting existing code, every media source must support both "reading
into pre-allocated memory (read)" and "read and return an allocated buffer
(map)". For devices without native memory-mapped ROM, "cbfs_simple_buffer*"
provides simple memory mapping simulation.
Every CBFS function now takes a cbfs_media* as parameter. CBFS_DEFAULT_MEDIA
is defined for CBFS functions to automatically initialize a per-board default
media (CBFS will internally calls init_default_cbfs_media). Also revised CBFS
function names relying on memory mapped backend (ex, "cbfs_find" => actually
loads files). Now we only have two getters:
struct cbfs_file *entry = cbfs_get_file(media, name);
void *data = cbfs_get_file_content(CBFS_DEFAULT_MEDIA, name, type);
Test results:
- Verified to work on x86/qemu.
- Compiles on ARM, and follow up commit will provide working SPI driver.
Change-Id: Iac911ded25a6f2feffbf3101a81364625bb07746
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: http://review.coreboot.org/2182
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
diff --git a/src/device/pci_rom.c b/src/device/pci_rom.c
index fe67515..bb0d760 100644
--- a/src/device/pci_rom.c
+++ b/src/device/pci_rom.c
@@ -35,7 +35,8 @@
struct pci_data *rom_data;
/* If it's in FLASH, then don't check device for ROM. */
- rom_header = cbfs_load_optionrom(dev->vendor, dev->device, NULL);
+ rom_header = cbfs_load_optionrom(CBFS_DEFAULT_MEDIA, dev->vendor,
+ dev->device, NULL);
u32 vendev = (dev->vendor << 16) | dev->device;
u32 mapped_vendev = vendev;
@@ -45,8 +46,10 @@
if (!rom_header) {
if (vendev != mapped_vendev) {
- rom_header = cbfs_load_optionrom(mapped_vendev >> 16,
- mapped_vendev & 0xffff , NULL);
+ rom_header = cbfs_load_optionrom(
+ CBFS_DEFAULT_MEDIA,
+ mapped_vendev >> 16,
+ mapped_vendev & 0xffff, NULL);
}
}