On 08/22/14 at 05:55am, Zheng, Lv wrote: > Hi, > > I checked the arch/x86/platform/efi/early_printk.c. > In early_efi_scroll_up(), 2 mapping entries will be used for the src/dst screen buffer. > In drivers/acpi/acpica/tbutils.c, we've improved the early table loading code in acpi_tb_parse_root_table(). > We now need 2 mapping entries: > 1. One mapping entry is used for RSDT table mapping. Each RSDT entry contains an address for another ACPI table. > 2. For each entry in RSDP, we need another mapping entry to map the table to perform necessary check/override before installing it. > > When acpi_tb_parse_root_table() prints something through EFI earlyprintk console, we'll have 4 mapping entries used. > The current 4 slots setting of early_ioremap() seems to be too small for such a use case. > > I'm not 100% sure if this is the cause. > If it's the cause and we think both of the mappings are reasonable, we can simply increase the FIX_BITMAPS_SLOTS defined in arch/x86/include/asm/fixmap.h. Hmm, will give see if I can do more debug, I can try what you suggested. Thanks Dave -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
