x86: sysreset: Set up LPC only after relocation
Probing LPC can cause PCI enumeration to take place, which significantly
increases pre-relocation memory usage. Also, LPC is somtimes enabled
directly by SPL.
Adjust the logic to probe the LPC only after relocation. This allows
chromebook_link64 to start up without a much larger
CONFIG_SYS_MALLOC_F_LEN value.
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/sysreset/sysreset_x86.c b/drivers/sysreset/sysreset_x86.c
index 8042f39..4936fdb 100644
--- a/drivers/sysreset/sysreset_x86.c
+++ b/drivers/sysreset/sysreset_x86.c
@@ -129,8 +129,13 @@
{
struct x86_sysreset_plat *plat = dev_get_plat(dev);
- /* Locate the PCH if there is one. It isn't essential */
- uclass_first_device(UCLASS_PCH, &plat->pch);
+ /*
+ * Locate the PCH if there is one. It isn't essential. Avoid this before
+ * relocation as we shouldn't need reset then and it needs a lot of
+ * memory for PCI enumeration.
+ */
+ if (gd->flags & GD_FLG_RELOC)
+ uclass_first_device(UCLASS_PCH, &plat->pch);
return 0;
}