From 83d26d1113d82e455439587d0d9418a357a1728e Mon Sep 17 00:00:00 2001 From: Ian Campbell Date: Wed, 21 Aug 2013 11:41:42 +0100 Subject: ARM: 7824/1: update advice on kernel, initramfs and FDT load address. - Recommend that the kernel be placed under 128MiB, this is required if CONFIG_AUTO_ZRELADDR=y and good (or at least not bad) advice even if CONFIG_AUTO_ZRELADDR=n. - Recommend that a zImage kernel be placed above 32MiB, this avoids the need to relocate prior to decompression, which can speed up boot. - Add basic info on the requirements when loading a raw (non-zImage) kernel which are stricter than the zImage requirements. - Recommend that the DTB be placed after the 128MiB boundary, avoiding any potential conflict with the kernel decompressor, and within the lowmem region. In practice it could follow the kernel loaded after 32MiB, assuming the kernel decompesses to less than 32MiB, but the 128MiB recommendation is simple and unambiguous. - Add similar recommendation regarding initramfs. Signed-off-by: Ian Campbell Cc: Nicolas Pitre Cc: Will Deacon Cc: Dave Martin Cc: Grant Likely Cc: Roy Franz Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Russell King --- Documentation/arm/Booting | 42 ++++++++++++++++++++++++++++++++---------- 1 file changed, 32 insertions(+), 10 deletions(-) (limited to 'Documentation/arm') diff --git a/Documentation/arm/Booting b/Documentation/arm/Booting index 0c1f475fdf36..371814a36719 100644 --- a/Documentation/arm/Booting +++ b/Documentation/arm/Booting @@ -18,7 +18,8 @@ following: 2. Initialise one serial port. 3. Detect the machine type. 4. Setup the kernel tagged list. -5. Call the kernel image. +5. Load initramfs. +6. Call the kernel image. 1. Setup and initialise RAM @@ -120,12 +121,27 @@ tagged list. The boot loader must pass at a minimum the size and location of the system memory, and the root filesystem location. The dtb must be placed in a region of memory where the kernel decompressor will not -overwrite it. The recommended placement is in the first 16KiB of RAM -with the caveat that it may not be located at physical address 0 since -the kernel interprets a value of 0 in r2 to mean neither a tagged list -nor a dtb were passed. +overwrite it, whilst remaining within the region which will be covered +by the kernel's low-memory mapping. -5. Calling the kernel image +A safe location is just above the 128MiB boundary from start of RAM. + +5. Load initramfs. +------------------ + +Existing boot loaders: OPTIONAL +New boot loaders: OPTIONAL + +If an initramfs is in use then, as with the dtb, it must be placed in +a region of memory where the kernel decompressor will not overwrite it +while also with the region which will be covered by the kernel's +low-memory mapping. + +A safe location is just above the device tree blob which itself will +be loaded just above the 128MiB boundary from the start of RAM as +recommended above. + +6. Calling the kernel image --------------------------- Existing boot loaders: MANDATORY @@ -136,11 +152,17 @@ is stored in flash, and is linked correctly to be run from flash, then it is legal for the boot loader to call the zImage in flash directly. -The zImage may also be placed in system RAM (at any location) and -called there. Note that the kernel uses 16K of RAM below the image -to store page tables. The recommended placement is 32KiB into RAM. +The zImage may also be placed in system RAM and called there. The +kernel should be placed in the first 128MiB of RAM. It is recommended +that it is loaded above 32MiB in order to avoid the need to relocate +prior to decompression, which will make the boot process slightly +faster. + +When booting a raw (non-zImage) kernel the constraints are tighter. +In this case the kernel must be loaded at an offset into system equal +to TEXT_OFFSET - PAGE_OFFSET. -In either case, the following conditions must be met: +In any case, the following conditions must be met: - Quiesce all DMA capable devices so that memory does not get corrupted by bogus network packets or disk data. This will save -- cgit v1.2.3-58-ga151