initrd-bootchain: add variable BOOTCHAIN_TMPFS_SIZE

features.in/initrd-bootchain/config.mk

@@ -22,3 +22,4 @@ use/initrd-bootchain:
 	@$(call try,BOOTCHAIN_OEM_CIFS_NETINST,/netinst)
 	@$(call try,BOOTCHAIN_LOGFILE,/var/log/chaind.log)
 	@$(call try,BOOTCHAIN_LOG_VT,3)
+	@$(call try,BOOTCHAIN_TMPFS_SIZE,50%)

features.in/initrd-bootchain/generate.mk

@@ -30,6 +30,7 @@ all: debug
 		-e "s,@oem_cifs_netinst@,$(BOOTCHAIN_OEM_CIFS_NETINST)," \
 		-e "s,@bc_logfile@,$(BOOTCHAIN_LOGFILE)," \
 		-e "s,@bc_log_vt@,$(BOOTCHAIN_LOG_VT)," \
+		-e "s,@bc_tmpfs_size@,$(BOOTCHAIN_TMPFS_SIZE)," \
 		$(BOOTCHAIN_CFG)
 
 debug:

features.in/initrd-bootchain/stage1/files/.disk/bootchain

@@ -16,6 +16,9 @@ BC_FGVT_ACTIVATE=@bc_fgvt_activate@
 # Full path to the bootchain log or character special device name
 BC_LOGFILE=@bc_logfile@
 
+# Specify the TMPFS size, by default it is 50% of available memory
+# BC_TMPFS_SIZE=@bc_tmpfs_size@
+
 # Common timeout in seconds for all waitdev steps:
 # this make possible using fallback after last waitdev step
 WAITDEV_TIMEOUT=@waitdev_timeout@